Call Us: (973) 256-3000 Plast-O-Matic Valves, Inc.
1384 Pompton Avenue
Cedar Grove, NJ 07009 USA
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High Performance 1/2" Pressure Regulator
Series PRHM

Our most popular 1/2" regulator...designed for high flow with pressure settings 5 to 125 psi...decades of proven performance

1/2-in PVC pressure regulator

Features: Series PRHM is a 1/2" molded version of Series PR/PRH with high flow capacity, minimal drop off from set pressure, and no external metal fasteners. 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*, or Kynar PVDF.
• Seals in EPDM or FKM.
• No external fasteners; ideal for nasty environments.
• High performance, heavy-duty design.
• Designed for low maintenance and easy to adjust.

For 3/4" & 1" sizes, please click here.

Corrosion resistant, also excellent for high purity and water applications. The standard connections are female NPT threaded ports. Socket, flanged and spigot connections are also available. Springs (not wetted) are stainless steel.

* Some Kynar PVDF components are used in the Natural Polypro models for strength.

Cutaway View




1/2" Pressure Regulator Performance Curves -- Flow Capacity vs. Pressure Drop-off

flow performance curves of series prh pressure regulator versus competitive valves

Drop-off is the difference between the pressure regulator set pressure and the actual downstream pressure.


Dimensions & Part Number Reference Chart for Series PRHM

flow performance curves of series prh pressure regulator dimensions of series PRHM
model numbers of series PRHM
ORDERING INFORMATION & MODEL NUMBERS The model numbers shown are PVC. To order Corzan CPVC, change -PV suffix to -CP, example: PRHM050-EP-CP. For Natural Polypro, change suffix to -PP; for Kynar PVDF change suffix to -PF. Note: Some Kynar PVDF components are used in the Natural Polypro models for strength.


Helpful Links:

Backpressure Valves
The pressure regulators described above are used to control downstream pressure. If you actually need to control pressure upstream, or "backpressure," please click on this link.

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.)



Plast-O-Matic Valves, Inc. 1384 Pompton Avenue Cedar Grove,
NJ 07009 USA Phone: (973) 256-3000 Fax: (973) 256-4745
California Warehouse 4054 Brewster Way Riverside, CA 92501
USA phone: (951) 686-2852 Fax: (951) 686-6328
Email: info@plastomatic.com Legacy home page: please click here