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- PDP
- PBP
- PT
- PTU
- PTUBW
- PTRP
- PTSW
- PTBW
- PTUSW
- Steam
- Liquid
- Gas
- 403 Piston
- 455 Piston
- B-Series
- W91/94 Self Op
- 3040 Series
- R-Series
- 10691 Series
HD Regulator – Main Valve
HD
Specifications
| Main Valve | HD Series |
| Sizes | 1/2’’ – 6’’ |
| Connections | NPT: 1/2’’ – 2’’
FLG: 1’’ – 6’’ |
| Body Material | Ductile Iron |
| PMO (Max. Operating Pressure) | 300 PSIG |
| Standard Main Valve | Inlet Pressure: 15-300 PSIG |
| Low-Pressure Main Valve | Inlet Pressure: 5-20 PSIG |
| Design Pressure/Temperature Ratings TMA/PMA | NPT 450 PSIG @ 650°F
150# FLG 150 PSIG @ 566°F 300# FLG 450 PSIG @ 650°F |
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Typical Applications
The HD Series Pilot-Operated Regulating Valve was designed for extremely accurate control of temperature and pressure in steam service applications. The HD-Series is made of Ductile Iron for extended pressure and temperature ratings. These regulators use several different control pilots which are mounted to the valve to control pressure, temperature or a combination of both. When two or more pilots are used at the same time – for example, both a pressure and a temperature pilot – an additional pilot adapter for the second pilot is required (must indicate when ordering).
HSP Regulator – Integrated Pressure Pilot
HSP
Specifications
| Model | HSP |
| Size | 1’’ – 4’’ |
| Connection Type | 150# FLG, 300# FLG |
| Body Material | Cast Steel |
| PMO Max | 450 PSIG |
| TMO Max | 650°F |
| PMA Max | 550 PSIG @ 650°F |
| TMA Max | 650°F @ 550 PSIG |
| Inlet Range | 5-20 PSI, 15-450 PSIG |
| Minimum Differential Pressure | 10 PSIG
3 PSIG |
| Reduced Pressure Range (PSIG) | 10 – 40 PSIG
25 – 100 PSIG 75 – 300 PSIG |
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Typical Applications
The HSP Series Main Valve with integral Pressure Pilot reduces steam pressure in steam system piping mains and process applications. This pilot-operated regulator is specifically used in applications where the properties and benefits of cast steel are desired and/or specified. Using steel as the material of construction for the main valve body extends the pressure temperature rating of the regulator. A unique two-bolt pilot adapter design and field-reversible tubing offer even greater versatility to this type of regulator, further reducing maintenance downtime. These valve share the same design and proven reliability of the Watson McDaniel HD-Series Regulators, providing extremely accurate control of downstream system pressure even when inlet pressure to the regulator fluctuates or steam usage varies.
HD Regulator – Pilot
PP
Specifications
| Pressure Pilot | PP (Standard: 1.0 psig accuracy)
PP5 (High-accuracy: 0.5 psig accuracy) |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Reduced Outlet Pressure Range (Nominal) | 3-200 PSIG |
| Inlet Pressure Range | 15-300 PSIG (with HD Standard main valve)
5-20 PSIG (with HD Low-Pressure (LP) main valve) |
| Working Range | 3-25 PSIG PP-Y
20-100 PSIG PP-B 80-200 PSIG PP-R 1-10 PSIG PP5-Y* 10-25 PSIG PP5-B* |
| Min. Differential Pressure | 10 PSI (with HD Standard main valve)
3 PSI (with HD Low-Pressure (LP) main valve) |
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Typical Applications
The PP & PP5 Pressure Pilots are used with the HD Regulator to control steam pressure in steam mains or for process equipment. Pilot-operated regulators maintain constant downstream pressure even when the inlet pressure to the valve fluctuates or steam usage varies. The PP-Pressure Pilot is adequate for controlling pressure in most industrial applications. For increased accuracy use the PP5 Pilot.
HD Regulator – Pilot
PA
Specifications
| Model | PA Series Air Pilots |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range(nominal) | 3-200°F |
| Working Range | 3-125 PSIG PA1
3-200 PSIG PA4 20-200 PSIG PA6 |
| Steam Inlet Pressure Range (Standard)
|
15-300 PSIG
(when Standard Temperature Pilot is used with HD Standard main valve) |
| Steam Inlet Pressure Range (Low) | 15-300 PSIG
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
| Min. Differential Pressure | 10 PSI Standard Main Valve
3 PSI Low Pressure Main Valve |
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Typical Applications
The PA Air-Loaded Pressure Pilot is used with the HD Regulator to control steam pressure on steam mains and process equipment. The principal advantage the PA-Air Pilot has over standard spring-loaded pilots is that pressure adjustments to the regulator can be made from a remote location. A regulator that is located in a difficult to reach or inaccessible location can be adjusted by a remote control panel board.
PL Series Remote Control Panel
PL
Specifications
| Model | PL1, PL2, PL3 |
| Min. Supply Air Pressure | 5 PSIG |
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Typical Applications
Three different options of remote-control panel boards can be used along with the Air Pilots. Supply air is fed directly through the control panel board to the air pilot. You can choose one of the three options of control panel boards when using the air piloted regulators.
PL1
The PL1 is made up of an air pressure regulator with adjustment knob and pressure gauge that measures the amount of air pressure going to the pilot (air signal). Steam pressure of the system is controlled by adjusting the air pressure regulator.
PL2
The PL2 is the same as the PL1 with the addition of an extra air pressure gauge for measuring the air supply pressure to the control panel board.
PL3
The PL3 is the same as the PL2 with the addition of a Steam Pressure Gauge for measuring steam pressure on the outlet side of the regulating valve.
HD Regulator – Pilot
PS
Specifications
| Solenoid Pilot (Electric) | PS1 & PS2 |
| Pilot Body Material | Cast Steel |
| Valve Head & Seat | Stainless Steel |
| Max Inlet Pressure | 250 PSIG |
| Nominal Range | 0-250 PSIG |
| Working Range | PS1 0-180 PSI
PS2 180-250 PSI |
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Typical Applications
The PS-Solenoid Pilot can be used in conjunction with Pressure, Temperature, or Air Pilots to electrically control on/off operation of the HD Regulator. When the solenoid pilot is used, the regulator can be enabled or disabled by electrically activating or de-activating the solenoid.
HD Regulator – Pilot
PDP
Specifications
| Back Pressure Pilot | PDP Series Differential Pressure Pilot |
| Pilot Body Material | Ductile Iron |
| Max Inlet Pressure | 300 PSIG |
| Reduced Outlet Pressure Range(nominal) | 3-200 PSIG |
| Working Range | 3-25 PSIG PDP-Y
20-100 PSIG PDP-B 80-200 PSIG PDP-R |
| Inlet Pressure Range
|
15-300 PSIG
(when used with HD Standard main valve) |
| Inlet Pressure Range
|
5-20 PSIG
(when used with HD-LP Low-Pressure main valve) |
| Min. Differential Pressure | 10 PSI Standard Main Valve
3 PSI Low Pressure Main Valve |
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Typical Applications
The PDP-Differential Pressure Pilot is used with the HD Regulator to maintain steam pressure at a set differential pressure above another media source. This is typical on an oil burner where steam used for atomization is injected into the oil burner at a set pressure above the incoming oil supply pressure. When oil pressure fluctuates (based on demand), the steam pressure will maintain a constant differential pressure above the oil pressure.
HD Regulator – Pilot
PBP
Specifications
| Back Pressure Pilot | PBP Series Back-Pressure Pilot |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Reduced Outlet Pressure Range (nominal) | 10-200 PSIG |
| Working Range | 10-25 PSIG PBP-Y
20-100 PSIG PBP-B 80-200 PSIG PBP-R |
| Inlet Pressure Range
|
15-300 PSIG
(when used with HD Standard main valve) |
| Inlet Pressure Range
|
5-20 PSIG
(when used with HD-LP Low-Pressure main valve) |
| Min. Differential Pressure | 10 PSI Standard Main Valve
3 PSI Low Pressure Main Valve |
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Typical Applications
The PBP Back-Pressure Pilots are used with HD Regulators to maintain upstream pressures in steam systems. When the upstream pressure reaches the pilot set point , the regulator opens. The HD Regulator with a PBP Back-Pressure Pilot is commonly used to supply steam to low-pressure mains. The PBP Back-Pressure Pilot maintains a constant back-pressure on the inlet side of the regulator. Should not be used in place of a safety relief valve.
HD Regulators – Pilot
PT
Specifications
| Temperature Pilot | PT – Copper Bulb |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range (Nominal) | 60-300°F |
| Steam Inlet Pressure Range (Standard) | 15-300 PSIG
(when Standard Temperature Pilot is used with HD Standard main valve) |
| Working Range
|
60-120°F
100-160°F 120-180°F 160-220°F 200-260°F 240-300°F |
| Steam Inlet Pressure Range (Low) | 5-20 PSIG
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
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Typical Applications
PT Bulb Type is plain copper sensing bulb that is directly immersed into the fluid. Normally the PT bulb type is lowered down vertically into the top of a tank or vat to a desired vertical insertion depth. The PT-Temperature Pilots are used with the HD regulator to control temperature in various processes and systems. Some examples are oil heaters, ovens, process heaters, vats, dryers and jacketed kettles. Thermostatic sensing bulb comes with standard 8-ft. or 15-ft. capillary lengths. Temperature adjustment is accomplished by rotating an adjustment knob to the desired temperature setting. The HD Regulator can be used with both the PP-Pressure Pilot and PT-Temperature Pilot simultaneously to limit pressure and control temperature in process applications.
Plain copper sensing bulb that is directly immersed into the fluid. Normally the PT bulb type is lowered down vertically into the top of a tank or vat to a desired vertical insertion depth.
HD Regulators – Pilot
PTU
Specifications
| Temperature Pilot | PTU – Copper Bulb w/ Union |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range(nominal) | 60-300°F |
| Working Range | 60-120°F
100-160°F 120-180°F 160-220°F 200-260°F 240-300°F |
| Steam Inlet Pressure Range (Standard) | 15-300 PSIG
(when Standard Temperature Pilot is used with HD Standard main valve) |
| Steam Inlet Pressure Range (Low) | 5-20 PSIG
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
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Typical Applications
PTU Bulb Type is Copper sensing bulb with Union connection allowing it to be screwed into the side of a tank or pipe. The sensing bulb is in direct contact with the process fluid. Sensing bulb can be removed by unscrewing union nut (union hub remains in place). The PT-Temperature Pilots are used with the HD regulator to control temperature in various processes and systems. Some examples are oil heaters, ovens, process heaters, vats, dryers and jacketed kettles. Thermostatic sensing bulb comes with standard 8-ft. or 15-ft. capillary lengths. Temperature adjustment is accomplished by rotating an adjustment knob to the desired temperature setting. The HD Regulator can be used with both the PP-Pressure Pilot and PT-Temperature Pilot simultaneously to limit pressure and control temperature in process applications.
Copper sensing bulb with Union connection allowing it to be screwed into the side of a tank or pipe. The sensing bulb is in direct contact with the process fluid. Sensing bulb can be removed by unscrewing union nut (union hub remains in place).
HD Regulators – Pilot
PTUBW
Specifications
| Temperature Pilot | PTUBW – Copper Bulb w/ Therowell |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range(nominal) | 60-300°F |
| Working Range | 60-120°F
100-160°F 120-180°F 160-220°F 200-260°F 240-300°F |
| Steam Inlet Pressure Range (Standard) | 15-300 PSIG
(when Standard Temperature Pilot is used with HD Standard main valve) |
| Steam Inlet Pressure Range (Low) | 5-20 PSIG
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
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Typical Applications
PTUBW & PTUSW Bulb Type is PTU style copper sensing bulb with Thermowell. The Isolation Well, which isolates the copper sensing bulb from the process fluid, is available in either Brass or 316L Stainless Steel. Sensing bulb can be removed by unscrewing union nut. Union Hub & Isolation Well remain in place which allows the removal of the sensing bulb without having to drain the tank. Stainless Steel Isolation Wells are used to protect the copper sensing bulb from corrosive fluids. Brass wells have better heat transfer. The PT-Temperature Pilots are used with the HD regulator to control temperature in various processes and systems. Some examples are oil heaters, ovens, process heaters, vats, dryers and jacketed kettles. Thermostatic sensing bulb comes with standard 8-ft. or 15-ft. capillary lengths. Temperature adjustment is accomplished by rotating an adjustment knob to the desired temperature setting. The HD Regulator can be used with both the PP-Pressure Pilot and PT-Temperature Pilot simultaneously to limit pressure and control temperature in process applications.
The Brass Well Isolation Well isolates the copper sensing bulb from the process fluid. Sensing bulb can be removed by unscrewing union nut. Union Hub & Isolation Well remain in place which allows the removal of the sensing bulb without having to drain the tank.
HD Regulator – Pilot
PTRP
Specifications
| Model | PTRP Temperature Pilot |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range(nominal) | 20-440°F |
| Nominal Range(°F)
20-70 40-90 30-115 50-140 75-165 105-195 125-215 155-250 200-280 225-315 255-370 295-420 310-440 |
Working Range(°F)
40-65 65-85 85-110 110-135 135-160 160-190 190-210 210-245 245-275 275-310 305-365 365-415 415-435 |
| Steam Inlet Pressure Range (Standard)
(when Standard Temperature Pilot is used with HD Standard main valve) |
15-300 PSIG |
| Steam Inlet Pressure Range (Low)
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
5-20 PSIG |
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Typical Applications
The PTRP-Temperature Pilot is used with the HD Regulator to control temperature in various processes and systems. The PTRP uses a vapor tension system to actuate the bellows in the temperature pilot giving it a faster reaction time and better temperature sensitivity than the standard PT pilot. They can be used on oil heaters, ovens, process heaters, vats, dryers, jacketed kettles, and semi-Instantaneous water heaters.
Sensing Bulb Selection & Installation:
The sensing bulb and capillary is available in either Copper (standard) or Stainless Steel (for corrosive applications). Copper has the best heat transfer properties and should always be chosen unless used in corrosive service. Sensing bulb length is dependent upon the capillary length required; longer capillary lengths require a longer bulb to hold the additional actuating fluid. When installing the sensing bulb, the Union Hub is first threaded into a tank or piping system. The bulb slides thru the Union Hub and held in place by threading in the union nut. The angled seating surface of the bulb forms a metal-to-metal seal to the Union Hub, preventing the leakage of process fluid.
HD Regulators – Pilot
PTSW
Specifications
| Temperature Pilot | PTSW – Copper Bulb w/ Extended SS Thermowell Temperature Pilot |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range(nominal) | 60-300°F |
| Working Range | 60-120°F
100-160°F 120-180°F 160-220°F 200-260°F 240-300°F |
| Steam Inlet Pressure Range (Standard) | 15-300 PSIG
(when Standard Temperature Pilot is used with HD Standard main valve) |
| Steam Inlet Pressure Range (Low) | 5-20 PSIG
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
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Typical Applications
PTBW & PTSW Bulb Type is PT style copper sensing bulb with Extended Length Thermowell. For deeper & variable insertion depths into tanks or vats; up to 18” deep. The extended length Isolation Well isolates the copper sensing bulb from the liquid and allows the copper sensing bulb insertion depth to be adjusted to a depth of up to 18”. They are available in either Brass or 316L Stainless Steel. Isolation Well remains in place which allows the removal of the sensing bulb without having to drain the tank. The PT-Temperature Pilots are used with the HD regulator to control temperature in various processes and systems. Some examples are oil heaters, ovens, process heaters, vats, dryers and jacketed kettles. Thermostatic sensing bulb comes with standard 8-ft. or 15-ft. capillary lengths. Temperature adjustment is accomplished by rotating an adjustment knob to the desired temperature setting. The HD Regulator can be used with both the PP-Pressure Pilot and PT-Temperature Pilot simultaneously to limit pressure and control temperature in process applications.
For deeper & variable insertion depths into tanks or vats; up to 18” deep. The extended length Stainless Steel Isolation Well isolates the copper sensing bulb from the liquid and allows the copper sensing bulb insertion depth to be adjusted to a depth of up to 18”. Isolation Well remains in place which allows the removal of the sensing bulb without having to drain the tank.
HD Regulator – Pilot
PTBW
Specifications
| Temperature Pilot | PTBW – Copper Bulb w/ Extended Thermowell Temperature Pilot |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range(nominal) | 60-300°F |
| Working Range | 60-120°F
100-160°F 120-180°F 160-220°F 200-260°F 240-300°F |
| Steam Inlet Pressure Range (Standard) | 15-300 PSIG
(when Standard Temperature Pilot is used with HD Standard main valve) |
| Steam Inlet Pressure Range (Low) | 5-20 PSIG
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
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Typical Applications
PTBW & PTSW Bulb Type is PT style copper sensing bulb with Extended Length Thermowell. For deeper & variable insertion depths into tanks or vats; up to 18” deep. The extended length Isolation Well isolates the copper sensing bulb from the liquid and allows the copper sensing bulb insertion depth to be adjusted to a depth of up to 18”. They are available in either Brass or 316L Stainless Steel. Isolation Well remains in place which allows the removal of the sensing bulb without having to drain the tank. The PT-Temperature Pilots are used with the HD regulator to control temperature in various processes and systems. Some examples are oil heaters, ovens, process heaters, vats, dryers and jacketed kettles. Thermostatic sensing bulb comes with standard 8-ft. or 15-ft. capillary lengths. Temperature adjustment is accomplished by rotating an adjustment knob to the desired temperature setting. The HD Regulator can be used with both the PP-Pressure Pilot and PT-Temperature Pilot simultaneously to limit pressure and control temperature in process applications.
For deeper & variable insertion depths into tanks or vats; up to 18” deep. The extended length Brass Well Isolation Well isolates the copper sensing bulb from the liquid and allows the copper sensing bulb insertion depth to be adjusted to a depth of up to 18”. Isolation Well remains in place which allows the removal of the sensing bulb without having to drain the tank.
HD Regulator – Pilot
PTUSW
Specifications
| Temperature Pilot | PTUSW – Copper Bulb w/ SS Thermowell Temperature Pilot |
| Pilot Body Material | Cast Steel |
| Max Inlet Pressure | 300 PSIG |
| Temperature Control Range(nominal) | 60-300°F |
| Working Range | 60-120°F
100-160°F 120-180°F 160-220°F 200-260°F 240-300°F |
| Steam Inlet Pressure Range (Standard) | 15-300 PSIG
(when Standard Temperature Pilot is used with HD Standard main valve) |
| Steam Inlet Pressure Range (Low) | 5-20 PSIG
(when Low-Pressure Temperature Pilot is used with HD-LP Low-Pressure main valve) |
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Typical Applications
PTUBW & PTUSW Bulb Type is PTU style copper sensing bulb with Thermowell. The Isolation Well, which isolates the copper sensing bulb from the process fluid, is available in either Brass or 316L Stainless Steel. Sensing bulb can be removed by unscrewing union nut. Union Hub & Isolation Well remain in place which allows the removal of the sensing bulb without having to drain the tank. Stainless Steel Isolation Wells are used to protect the copper sensing bulb from corrosive fluids. Brass wells have better heat transfer. The PT-Temperature Pilots are used with the HD regulator to control temperature in various processes and systems. Some examples are oil heaters, ovens, process heaters, vats, dryers and jacketed kettles. Thermostatic sensing bulb comes with standard 8-ft. or 15-ft. capillary lengths. Temperature adjustment is accomplished by rotating an adjustment knob to the desired temperature setting. The HD Regulator can be used with both the PP-Pressure Pilot and PT-Temperature Pilot simultaneously to limit pressure and control temperature in process applications.
The Stainless-Steel Isolation Well isolates the copper sensing bulb from the process fluid. Sensing bulb can be removed by unscrewing union nut. Union Hub & Isolation Well remain in place which allows the removal of the sensing bulb without having to drain the tank. Stainless Steel Isolation Wells are used to protect the copper sensing bulb from corrosive fluids. Brass wells have better heat transfer.
O-Series Regulator for Steam
Steam
Specifications
| Model | O-Series |
| Service | Steam, Air, Water & Other Liquids |
| Sizes | 3/8’’, 1/2’’, 3/4’’, 1’’, 1-1/4’’, 1-1/2’’, 2’’ |
| Connections | NPT |
| Body Material | Cast Iron |
| Seat & Disc | Hardened 420 Stainless Steel |
| Diaphragm (for Steam) | Phosphor Bronze – Steam |
| Max. Capacity | 2,141 lbs/hr |
| Max. Inlet Pressure | 250 PSIG |
| Min. Inlet Pressure | 15 PSIG |
| Max. Differential Pressure | 125 PSI |
| Min. Differential Pressure | 15 PSI |
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Typical Applications
The O-Series direct-operated pressure regulators with heavy-duty cast-iron bodies and internal strainer are suitable for a wide range of applications in the low-to-moderate flow range. Applications include small heaters, humidifiers, various hospital equipment, tire molds, as well as many other general uses. This style of regulator does not require an external sensing line. Set pressure is controlled by turning an adjustment screw with lock nut that increases or decreases spring force above the diaphragm. Several spring ranges are available, depending upon the downstream pressure that needs to be maintained. O-Series contains hardened stainless-steel seat and disc for extended service life. Phosphor Bronze Diaphragm specifically designed for Steam service is considered a preferred choice over Stainless Steel diaphragms which are prone to work-hardening and potential cracking. Viton diaphragms are specifically designed for water, air, gases and other liquid service and have a working temperature range up to 300°F.
O-Series Regulator for Liquid
Liquid
Specifications
| Model | O-Series |
| Service | Steam, Air, Water & Other Liquids |
| Sizes | 3/8’’, 1/2’’, 3/4’’, 1’’, 1-1/4’’, 1-1/2’’, 2’’ |
| Connections | NPT |
| Body Material | Cast Iron |
| Seat & Disc | Hardened 420 Stainless Steel |
| Diaphragm (for Steam) | Phosphor Bronze – Steam |
| Diaphragm (for Liquid or Air) | Viton – Water, Air & Oil (300°F Max) |
| Max. Capacity | 116 GPM |
| Max. Inlet Pressure | 250 PSIG |
| Min. Inlet Pressure | 15 PSIG |
| Max. Differential Pressure | 125 PSI |
| Min. Differential Pressure | 15 PSI |
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Typical Applications
The O-Series direct-operated pressure regulators with heavy-duty cast-iron bodies and internal strainer are suitable for a wide range of applications in the low-to-moderate flow range. Applications include small heaters, humidifiers, various hospital equipment, tire molds, as well as many other general uses. This style of regulator does not require an external sensing line. Set pressure is controlled by turning an adjustment screw with lock nut that increases or decreases spring force above the diaphragm. Several spring ranges are available, depending upon the downstream pressure that needs to be maintained. O-Series contains hardened stainless-steel seat and disc for extended service life. Phosphor Bronze Diaphragm specifically designed for Steam service is considered a preferred choice over Stainless Steel diaphragms which are prone to work-hardening and potential cracking. Viton diaphragms are specifically designed for water, air, gases and other liquid service and have a working temperature range up to 300°F.
O-Series Regulator for Gas
Gas
Specifications
| Model | O-Series |
| Service | Steam, Air, Water & Other Liquids |
| Sizes | 3/8’’, 1/2’’, 3/4’’, 1’’, 1-1/4’’, 1-1/2’’, 2’’ |
| Connections | NPT |
| Body Material | Cast Iron |
| Seat & Disc | Hardened 420 Stainless Steel |
| Diaphragm (for Steam) | Phosphor Bronze – Steam |
| Diaphragm (for Liquid or Air) | Viton – Water, Air & Oil (300°F Max) |
| Max. Capacity | 1,189 SCFM |
| Max. Inlet Pressure | 250 PSIG |
| Min. Inlet Pressure | 15 PSIG |
| Max. Differential Pressure | 125 PSI |
| Min. Differential Pressure | 15 PSI |
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Typical Applications
The O-Series direct-operated pressure regulators with heavy-duty cast-iron bodies and internal strainer are suitable for a wide range of applications in the low-to-moderate flow range. Applications include small heaters, humidifiers, various hospital equipment, tire molds, as well as many other general uses. This style of regulator does not require an external sensing line. Set pressure is controlled by turning an adjustment screw with lock nut that increases or decreases spring force above the diaphragm. Several spring ranges are available, depending upon the downstream pressure that needs to be maintained. O-Series contains hardened stainless-steel seat and disc for extended service life. Phosphor Bronze Diaphragm specifically designed for Steam service is considered a preferred choice over Stainless Steel diaphragms which are prone to work-hardening and potential cracking. Viton diaphragms are specifically designed for water, air, gases and other liquid service and have a working temperature range up to 300°F.
403 Series Regulator
403 Piston
Specifications
| Model | 403 Series (External & Internal) |
| Service | Steam & Air |
| Sizes | 1/2’’ – 4’’ |
| Connections | NPT, 150# FLG, 300# FLG |
| Body Material | Ductile Iron |
| Seat & Disc | Hardened 420 Stainless Steel (55 Rc) |
| Max. Inlet Pressure | 450 PSIG |
| Min. Inlet Pressure | 20 PSIG |
| Max. Differential Pressure | 250 PSI |
| Min. Differential Pressure | 15% of Inlet Pressure (10 PSI Minimum) |
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Typical Applications
The 403 piston-actuated pressure regulating are pilot-operated, piston-actuated, pressure regulators primarily used for reducing pressure in steam systems. These regulators can be equipped with an optional internal sensing line which simplifies installation (Suffix I). The 403 Series has all stainless-steel internals for high-pressure applications up to 450 PSIG. Double Spring Option is available for wider range of reduced pressures.
455 Series Regulator
455 Piston
Specifications
| Model | 455 Series Piston-Actuated Pilot-Operated |
| Service | Steam, Air & Other Gases |
| Sizes | 1/2’’ – 4’’ |
| Connections | NPT, 125# FLG, 250# FLG |
| Body Material | ½” – 1 ½” SS Body/Brass Stuffing Box
2”- 4” Cast Iron |
| Seat & Disc | Stainless Steel |
| Diaphragm | Neoprene/Nylon |
| Max. Inlet Pressure | 250 PSIG |
| Min. Inlet Pressure | 5 PSIG |
| Max. Differential Pressure | 125 PSI |
| Min. Differential Pressure | 20% of Inlet Pressure |
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Typical Applications
The 455 Series direct-operated pressure regulating valves are used for pressure reduction applications on steam, air and other gases. Balanced seat and disc design allow these valves to be used in applications with low inlet pressure; down to 5 PSIG. Unlike pilot-operated valves, the 455 does not contain any small pilot orifices and are therefore less susceptible to issues caused by dirt and pipe scale. The 455-Series is installed using an external sensing line which is connected several feet downstream of the valve. Placing the pressure sensing location out of range of valve discharge turbulence makes it more accurate in controlling downstream pressure.
B-Series Regulator
B-Series
Specifications
| Model | B-Series |
| Service | Water, Air, Oil, Other Gases & Liquids |
| Sizes | 1/2’’ – 4’’ |
| Connections | NPT, 125# FLG, 250# FLG |
| Body Material | 1/2’’ – 2-1/2’’ Bronze
3’’ & 4’’ Cast Iron |
| Disc & Diaphragm | Viton – 300°F max |
| Max. Capacity (Liquid)
Max. Capacity (Gas) |
984 GPM
12,880 SCFM |
| Max. Inlet Pressure | 250 PSIG |
| Min. Inlet Pressure | 10 PSIG |
| Max. Differential Pressure | 125 PSI |
| Min. Differential Pressure | 20% of Inlet Pressure |
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Typical Applications
The B-Series Pressure regulators are primarily used for reducing pressure in water systems. Also suitable for air, oil, and other liquids or gasses. The B-Series offers much higher capacities than the O-Series. These regulators are commonly found in industrial plants, apartment buildings, schools, and water distribution and supply systems.
Self Operated Temperature Regulators
W91/94 Self Op
Specifications
| Model | W91 (No Indicating Dial)
W94 (Temperature Indicating Dial) |
| Service | Water, Steam, Other Liquids |
| Sizes | 1/2’’ – 4’’ |
| Connections | Threaded, Union Ends, 125# FLG 250# FLG |
| Body Material | 1/2’’ – 1-1/2’’ Bronze/Stainless Steel
2’’ Cast Iron (Direct-acting) 2’’ Bronze (Reverse-acting) 2-1/2’’ – 4’’ Cast Iron |
| Seat Material | Stainless Steel |
| Max. Inlet Pressure | 250 PSIG |
| Heating | In-To-Close Normally Open |
| Cooling | In-To-Open Normally Closed |
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Typical Applications
The W91 & W94 Self-Operating Temperature Regulators are the preferred choice of original equipment manufacturers, mechanical contractors and specifying engineers. They require no external power source and are ideal for regulating the temperature of tanks, process streams and various types of industrial equipment. The Actuator is noted for its rugged die-cast aluminum housing, fully-enclosed bellows assembly and internal over-temperature range protection.
Model W91 Non-Indicating (without indicating dial) features a lower profile and should be specified where space constraints may be an issue.
Model W94 Temperature Indicating (with indicating dial) will allow the operator to verify the process temperature and to aid in temperature adjustment.
Relief & Back Pressure Valves
3040 Series
Specifications
| Model | 3040 Series |
| Service | Water, Oil, other Liquids, Air |
| Sizes | 1/2’’, 3/4’’, 1’’, 1-1/4’’, 1-1/2’’, 2’’ |
| Connections | NPT, 125# FLG, 250# FLG |
| Body Material | 1/2’’ – 1-1/2’’ NPT, SS Body, SS Diaphragm Chamber
2’’ NPT, Cast Iron Body 2’’ FLG, Cast Iron Body |
| Seat Material | Stainless Steel |
| Disc Material | Viton – 300°F max |
| Diaphragm | Viton – 300°F max |
| Max. Inlet Pressure | 250 PSIG |
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Typical Applications
The 3040 Series Back Pressure Valves relieve upstream pressure in a variety of processes. Automatically maintains desired maximum pressure in a vessel or system by relieving excess pressure into lower pressure return line or to atmosphere. Ideally suited for use as pump bypass control valve by maintaining constant pump discharge pressures. Used as a continuously operating valve or for intermittent protection against over-pressure conditions.
Relief & Back Pressure Valves
R-Series
Specifications
| Model | R Series |
| Service | Liquids |
| Sizes | 1/2’’ – 3’’ |
| Connections | NPT |
| Body Material | Bronze |
| Seat Material | Bronze |
| Disc Material | Stainless Steel (1/2’’ – 1-1/2’’)
Bronze (2’’ – 3’’) |
| Max. Inlet Pressure | 300 PSIG |
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Typical Applications
The R-Series Back Pressure & Relief Valves relieve upstream pressure in a variety of processes. R-Series has a stainless steel disc. This valve automatically maintains desired maximum pressure in a vessel or system by relieving excess pressure into lower pressure return line or to atmosphere. Ideally suited for use as pump bypass control valve by maintaining constant pump discharge pressures. Used as a continuously operating valve or for protection against intermittent over pressure conditions.
The R-Series Back Pressure Relief Valves are used in the following applications :
• Water pump bypass for irrigation, sprinkler systems on golf courses, fountains and fire protection systems.
• Fuel oil pump bypass on commercial systems or large residential systems.
Relief & Back Pressure Valves
10691 Series
Specifications
| Model | 10691 Series |
| Service | Liquids |
| Sizes | 1/2’’, 3/4’’, 1’’ |
| Connections | NPT |
| Body Material | Bronze |
| Seat Material | Bronze |
| Disc Material | EPDM*
Optional Viton or Teflon |
| Max. Inlet Pressure | 300 PSIG |
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Typical Applications
The 10691-Series Back Pressure & Relief Valves relieve upstream pressure in a variety of processes. 10691-Series has a soft elastomeric disc for tight shut-off. This valve automatically maintains desired maximum pressure in a vessel or system by relieving excess pressure into lower pressure return line or to atmosphere. Ideally suited for use as pump bypass control valve by maintaining constant pump discharge pressures. Used as a continuously operating valve or for protection against intermittent over pressure conditions.
The 10691-Series Back Pressure Relief Valves are used in the following applications :
• Water pump bypass for irrigation, sprinkler systems on golf courses, fountains and fire protection systems.
• Fuel oil pump bypass on commercial systems or large residential systems.