Spring operated, air operated & differential pressure regulators -- also known as pressure reducing valves or forward pressure regulators
True Blue® Pressure Regulators help you manage pressure "downstream" of the valve.
Uses of these versatile regulators...
• Prevent overpressure conditions to downstream equipment such as filters, sensitive tools, etc.
• Convert excessive or wildly fluctuating upstream pressure to a constant predetermined downstream pressure.
• Control pressure differential (Delta P) across downstream system equipment (Refer to Series PRD below).
• Regulate to the correct pressure range so that a flow system or piece of equipment can operate safely and effectively.
These valves have many outstanding features...
• Offer wide range of pressure settings with smooth, sensitive operation.
• Engineered thermoplastics for corrosive and ultra pure liquids.
• One piece body construction eliminates internal leakage that can cause malfunction.
• Pressure sensing is done with rolling diaphragms. These have the largest surface area among all diaphragm regulator designs, which results in the greatest accuracy. Furthermore, the sensing chamber is isolated from the flow path, so it provides unrestricted flow.
• Each valve is individually tested prior to shipment.
• No wetted metals; all external fasteners are stainless steel, control springs on spring loaded models are not in the liquid.
• Maintenance-free designs.
• Factory pre-set if requested.
• Internal sensing area flush option.
Common misconceptions about Pressure Regulators • A pressure regulator cannot increase pressure. If upstream pressure drops below the set point, downstream pressure will also...a pressure regulator does not function like a pump.
• Pressure regulators will not function as backpressure regulators. Pressure regulators are normally-open valves that are used to prevent downstream pressure from exceeding a predetermined set point. In some applications this is known as forward pressure control.
• While they affect flow rates, "pressure regulators" are sometimes applied in systems to control flow -- but they are designed to control pressure, not flow. To assure specific flow rates, Plast-O-Matic offers an extremely accurate and cost-effective flow control valve.
• Speaking of flow, it is important to remember that many manufacturers offer "pressure regulators" that strangulate more than they regulate; none deliver the same flow capacity as a Plast-O-Matic regulator. Typically, most regulators sense pressure with an actual restriction in the pipeline...Plast-O-Matic designs use a separate pressure sensing chamber off the downstream outlet that allows unimpeded flow. The "restriction" regulator designs also create a significant drop-off from set pressure when flow rate increases. The Plast-O-Matic regulators below all provide minimal drop-off from set pressure, while providing the maximum flow capacity your system may require.
IMPORTANT NOTE: Effective pressure regulation requires minimal or no pressure loss from your desired set point, with minimal impact on flow capacity. All of the valves listed below represent the ultimate combination of downstream or forward pressure regulation and flow performance.
All Plast-O-Matic Pressure Regulators are 100% Manufactured in USA
 Series PRHM Premium performance, Complete (5-125 psi) set range, 1/2" size in PVC, CPVC, Polypro, PVDF: Series PRHM is a molded version of Series PRH. Design incorporates a poppet seat, double u-cups, large area rolling diaphragm and one piece body construction. A pressure balanced shaft assures smooth and stable control, while the valve design provides excellent flow performance.
• Pressure setting is infinitely adjustable from 5 psi to 125 psi.
• Maximum inlet pressure is 150 psi.
• Available in 1/2" Geon PVC, Corzan CPVC, natural polypropylene, Kynar PVDF.
• Seals in EPDM or FKM.
• High performance, heavy-duty design.
• Designed for low maintenance and easy to adjust. |
Please click here for complete specifications.
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 Series PRHM Premium performance, Complete (5-125 psi) set range, 3/4" and 1" sizes, PVC, CPVC, Polypro, PVDF: Series PRHM is a molded version of Series PRH. Design incorporates a poppet seat, double u-cups, large area rolling diaphragm and one piece body construction. A pressure balanced shaft assures smooth and stable control, while the valve design provides excellent flow performance.
• Pressure setting is infinitely adjustable from 5 psi to 125 psi.
• Maximum inlet pressure is 150 psi.
• Available in 3/4" & 1" Geon PVC, Corzan CPVC, natural polypropylene, Kynar PVDF.
• Seals in EPDM or FKM.
• High performance, heavy-duty design.
• Designed for low maintenance and easy to adjust.
• Valves may be shipped with or without a "rising" adjusting bolt, depending on size/materials. For more information about the rising or non-rising stem, please click here. | Please click here for complete specifications.
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 Series PRH Premium performance, Complete (10-125 psi) set range: Series PRH design incorporates a poppet seat, double u-cups, large area rolling diaphragm and one piece body construction. A pressure balanced shaft assures smooth and stable control, while the valve design provides excellent flow performance.
• Pressure setting is infinitely adjustable from 10 psi to 125 psi.
• Maximum inlet pressure is 150 psi.
• Sizes 1/4", 1 1/2", 2" & 3" in PVC.
• Sizes 1/4", 1 1/2" & 2" in CPVC.
• Sizes 1/4", 1 1/2", 2" in Natural Polypro.
• Sizes 1/4", 1/2", 3/4", 1" in PTFE.
• Sizes 1/4", 1 1/2", 2" & 3" in PVDF.
• Seals in EPDM or FKM.
• High performance, heavy-duty design.
• Designed for low maintenance and easy to adjust.
• Within the size range 3/4" thru 2", valves may be shipped with or without a "rising" adjusting bolt, depending on size/materials. For more information about the rising or non-rising stem, please click here.
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Please click here for complete specifications (a more complete web page on Series PRH)
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 Series PRH/PRHM Socket & BCF Spigot Specifications Standard Series PRH and PRHM with factory installed sockets or BCF Spigots (For GF, Asahi or IPS pipe). This version of the PRH/PRHM line features a machined body in 1/2" size in all materials.
• Pressure setting is infinitely adjustable from 10 psi to 125 psi.
• Maximum inlet pressure is 150 psi.
• 1/2" Machined Body w/standard adjusting bolt
• 3/4" through 2" Molded or Machined Body w/non-rising adjustment
• Factory installed sockets or spigots
• Within the size range 3/4" thru 2", valves may be shipped with or without a "rising" adjusting bolt, depending on size/materials. For more information about the rising or non-rising stem, please click here. | Please click here for complete specifications (Catalog Sheet PR-NTL)
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 Series PRH/PRHM Corzanฎ CPVC Valve Specifications Standard Series PRH and PRHM in Corzan CPVC. This version of the PRH/PRHM line a slight reduction in flow performance on 2" sizes, however still superior to competitive offerings. This catalog also has specifications for the 1/2" machined body, which is a special order.
• Pressure setting is infinitely adjustable from 10 psi to 125 psi.
• Maximum inlet pressure is 150 psi.
• 1/2" Machined Body w/standard adjusting bolt (special order)
• 3/4" through 2" Molded or Machined Body w/non-rising adjustment
• Threaded, sockets or spigots
• Within the size range 3/4" thru 2", valves may be shipped with or without a "rising" adjusting bolt, depending on size/materials. For more information about the rising or non-rising stem, please click here. | Please click here for complete specifications (Catalog Sheet PR-NTL-CP)
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 Series PRH-U Ultrapure performance, Complete (10-125 psi) set range: Series PRH-U is a special version of Series PRH designed exclusively for use in ultrapure applications. It features machined Kynar type 740 PVDF bodies, metal-ion free EPDM, and three separate cleaning procedures. PRH-U is shipped standard with choice of Asahi, GF or IPS spigot connections. Non-rising stem on 3/4" and 1" sizes.
• Maximum inlet pressure is 150 psi.
• Sizes 1/2" through 3".
• Capped external fasteners.
• New non-rising, smooth flow stem design.
• Proprietary pre-assembly cleaning procedure.
• 8-hour cold/8-hour hot DI rinse.
• Final clean & double bag in Class 100 cleanroom.
• High performance, heavy-duty design.
• Designed for low maintenance and easy to adjust. | Please click here for complete specifications (cut sheet for Series PRH-U)
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 Series PRU Ultra-pure pressure regulator: Series PRU uses a convoluted PTFE diaphragm to sense pressure and isolate the spring used to regulate pressure. The internal shaft is PTFE. No elastomers or metals are in contact with liquid. Design incorporates one piece body construction and no external fasteners. A pressure balanced shaft assures smooth and stable control, while the valve design provides excellent flow performance.
• Pressure setting is infinitely adjustable from 5 psi to 100 psi.
• Maximum inlet pressure is 120 psi.
• Available in PTFE, Natural polypropylene, and Kynar PVDF.
• 1" Pipe connection in socket, spigot, flare (threaded into body) or NPT.
• Seals are PTFE.
• High performance, heavy-duty design. | For complete specifications (a more complete web page on Series PRU) please click here
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 Series UPR ultrapure pressure regulator: Series UPR uses a convoluted PTFE diaphragm to sense pressure and isolate the spring used to regulate pressure. No elastomers or metals are in contact with liquid in the ultra-high purity, non-positive shut-off version. Design incorporates one piece body construction and no external fasteners. Highest industry flow performance/minimal droop.
• Pressure setting is infinitely adjustable from 5 psi to 50 psi; Series UPRH has settings to 50-100 psi.
• Maximum inlet pressure is 120 psi.
• Available in Kynar PVDF.
• ฝ - 2" Pipe connection in socket, spigot, flare, or NPT.
• Convoluted diaphragm is PTFE.
• High performance, heavy-duty design.
• For applications requiring positive shut-off, an alternate version with minimal elastomers is available; consult factory. | For complete specifications (a more complete web page on Series UPR) please click here
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 Series PRD Differential pressure regulator: Series PRD is a differential pressure regulator based on Series PR (above) with two threaded ports. One port is for a downstream pressure sensing line, the other is fitted with a bleed screw to exhaust air from the housing. Otherwise, design is identical to Series PR/PRH. The sensing line feeds the pressure downstream (P3) of the equipment being protected to the top of the spring housing (also P3). This pressure assists the spring in keeping the regulator open against the pressure directly at the regulator outlet (P2). When pressure downstream begins to drop (as it would when a filter becomes more and more clogged), the regulator begins to close and becomes fully closed when the differential setting is reached. This assures against overpressure across the bank of filters or whatever the equipment may be. The differential pressure setting is P2 minus P3.
• Pressure setting is infinitely adjustable from 10 psi to 50 psi.
• Maximum inlet pressure is 150 psi.
• Sizes 1/4", 1/2", 3/4", 1", 1-1/2", 2" & 3".
• Installs easily; common tubing is used to connect to desired point downstream.
• Spring is fluoropolymer coated since downstream liquid is in contact.
• High performance, heavy-duty design.
• Designed for low maintenance and easy to adjust. |
Please click here for specifications (a more complete web page on Series PRD)
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 Series PRA Air loaded pressure regulator: Series PRA uses the standard air from a compressor instead of a spring to generate the force needed to regulate pressure. Design incorporates a poppet seat, double u-cups, large area rolling diaphragm and one piece body construction. A pressure balanced shaft assures smooth and stable control, while the valve design provides excellent flow performance.
A common self-relieving type compressed air valve is needed to connect your compressed air line to the regulator. The PRA will mimic whatever pressure you apply to the top via the self-relieving valve. If you apply 40 psi to the top of the PRA, you can expect downstream liquid pressure to be 40 psi as well.
• Pressure setting is infinitely adjustable from 5 psi to 125 psi.
• Maximum inlet pressure is 150 psi.
• Available in PVC, Natural polypro, and Kynar PVDF;
• Sizes 1/4", 1/2", 3/4", 1", 1-1/2", 2" & 3".
• Seals in EPDM or FKM.
• High performance, heavy-duty design.
• Outperforms spring loaded regulators through improved response to pressure changes; pressure is maintained without sacrificing flow.
• Performance rivals exotic control valves but at much lower cost.
• Used with the optional Stabilizer -- U.S. Patent No. 6,418,956 -- Series PRS, this air-loaded regulator will perform with virtually zero drop off from set pressure.
• Incorporates the patented Fail Dry safety vent. |
For a .PDF file - please click here: PRA Pressure Regulators - (PDF)
For complete specifications (a more complete web page on Series PRA) please click here
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Dimensions & Specifications:Please click on the appropriate link for web page with complete specifications:
Series PRHM
High performance 5 to 125 psi set pressure 1/2" PVC/CPVC/PP/PVDF
Series PRHM
High performance 5 to 125 psi set pressure 3/4" and 1" PVC/CPVC/PP/PVDF
Series PRH
High performance 10 to 125 psi set pressure 1/4" through 3" sizes
Series PRH-U
Ultrapure version of Series PRH
Series PRD
Differential pressure regulators 1/4" through 3" sizes
Series PRA
Air loaded pressure regulator 5 to 125 psi set pressure 1/4" through 3" sizes for the ultimate control and performance
Non-Rising Stem
Depending on size/materials, certain valves are shipped with a non-rising adjustment bolt
HELPFUL LINKS:
Pressure Regulator Performance Comparison Curves
Explanation and diagram of the patented Fail Dry safety vent. This is available on Series PRA air loaded regulators.
5 Most Common Mistakes When Specifying Valves
Valve Pressure Loss & Flow - Q&A and Equations
(Explains Cv and Delta P, how to better specify valves, etc.) Discontinued Valves - for engineering reference only Series PRE - discontinued 2011 - link provided for reference only
Series PR - 5-50 PSI set - discontinued 2009 - link for reference only
ORDERING INFORMATION:Note: For complete information contact our Technical Sales Group at 973 256-3000 to discuss your specific needs, or please use the "Request for Quote" link to initiate the process. 
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