Regulators will create a certain level of pressure drop of the liquid as it passes through the valve.   This is how the pressure is decreased.  If recommend flow rates are exceeded, the down stream pressure may be less than expected.  Each of the following valves has slight differences as to flow vs. pressure drop.  This information must be considered when designing a system and selecting a valve.  We recommend that a valve be selected with inlet pressure, flow rate and set pressure data being supplied.

Applications / Advantages

• Automatically regulates downstream pressure
• Converts varying upstream pressure to a pre-determined maximum downstream pressure
• Regulates maximum pressure for flow systems or equipment operation
• Maximum inlet pressures up to 150 PSI
• Adjustable setting available from 5 to 50 PSI with standard supplied springs
• Adjustable setting available from 5 to 75 PSI (PRM  only)
• Adjustable setting available from 5 to 125 PSI (PRH only)
• Adjustable setting available from 10 to 65 PSI (PRE only)
•  PRH valves manufactured after 1-1-98 are rated pressure to 125 PSI

Design -  The design incorporates a poppet seat at the valve orifice to prevent sticking and double U-cup seals on the internal shaft to prevent inlet pressure from affecting the sensing of the downstream line pressure.  Also, the one piece body construction eliminates internal leakage that could cause the set pressure to creep beyond a safe limit.  A unique rolling diaphragm seal isolates the spring chamber from the downstream pressure sensing liquid.   A pressure balanced shaft assures smooth and stable control.

For further information regarding pressure regulators - CLICK HERE.

PR and PRH Series for downstream pressure control

Designed for high flow rates with a minimum for pressure setting tolerance.  This is Plast-O-Matic's premier regulator with performance unmatched by competitors.

PVC, polypropylene, Teflon® and PVDF

• Viton®, EPDM or Buna-N® seals
• 1/4" to 3" FNPT
• 5 to 50 PSI (standard)
• 5 to 125 PSI (PRH version)
• flow rates to 200 GPM

PRM Series - Molded body for downstream pressure control

A molded body version of the PR valve offering flows and performance near the PR Series

• Plastic adjustment screw
• PVC with Viton® or EPDM seals
• 1/2" FNPT only
• 5 to 75 PSI set pressure
• Mounting holes are standard
• Gauge taps are optional

PRD - Differential Pressure Regulators

For controlling the differential pressure across equipment such as membrane filters

• PVC, polypropylene, Teflon® and PVDF
• 1/4" to 3" FNPT

PRE Series - Compact Pressure Regulators

Designed for application requiring lower flow rates than the PR Series at a reduced cost for the valve.  For less demanding applications that still require downstream pressure regulation.

• PVC, polypropylene and PVDF
• Viton®, EPDM or Buna-N® seals
• 3/4" and 1" FNPT
• 10 to 125 PSI Set Pressures
• flow rates to 22 GPM for 3/4" size
• flow rates to 35 GPM for 1" size

PRA Series - Air loaded pressure regulator

The Stabilizer®
The Stabilizer is a closed-loop, proportional controller. It maintains process fluid pressure at a constant, preset value by modulating air pressure to the regulator. The combination of The Stabilizer and an Air-Loaded Pressure Regulator eliminates the need for an exotic, expensive control valve in most applications.

Series PRS in foreground, and shown in a typical configuration piped downstream of Series PRA, Air-Loaded Pressure Regulator.

Features:

• Used with an Air-Loaded Regulator, Series PRS reacts instantly to fluctuations in pressure, significantly enhancing the accuracy of the air-loaded regulator - downstream pressure has virtually no deviation from set pressure.
• Desired pressure is maintained without sacrificing flow. Performance rivals control valves, at much lower cost.
• Ideal for applications with changing pressure requirements.
• Can be conveniently teed into piping at desired control point, or may be mounted at a more convenient location and connected with tubing for static pressure sensing.
• Easy to set; adjustable from 5 PSI to 125 PSI.
• PTFE diaphragm for critical ultra-pure and corrosive liquid applications.
• No wetted metal or elastomer parts.

Materials of Construction & Piping Connections:

Standard liquid connection is ½" male NPT threaded. Standard air or hydraulic connections are 1/8" female NPT. Connection to valve air chamber should be ¼" or larger tubing. Standard body materials are Geon® Grade 1 Type 1 PVC, Natural Polypropylene, Kynar® PVDF and Teflon® PTFE. Standard seal material is a PTFE diaphragm backed with Viton®. Some Kynar PVDF components are used in the Natural Polypropylene models for strength. Adjusting bolt and external fasteners are stainless steel. A Buna-N rubber seal is used in the air chamber. For connection types and materials other than listed, please consult factory.

Performance:

Comparison of Air-Loaded Regulator performance with and without the patented Stabilizer. Note that the pressure axis in this graph shows only 16 PSI of the total range; this was done to better illustrate the effectiveness of the Stabilizer.  Within this limited range, competitive regulators are below the scale and therefore are not plotted.

Performance Comparison of 1" Air-Loaded Regulator with and without The Patented Stabilizer