Pressure Regulation

Plast-O-Matic Series PRHM pressure regulators are designed to handle corrosive and ultra-pure liquids with inlet pressures up to 150 psi at 75°F. The standard downstream set pressure range is 5 to 125 psi; however, with special springs it can reach 75 psi. 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 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 liquid. This unique design, in conjunction with a pressure balanced shaft, assures smooth and stable control. Series PRHM pressure regulators prevent downstream pressure from exceeding the desired set pressure. The regulator will remain closed as long as the set pressure is maintained. As equipment or valves downstream of the regulator begin to open and demand flow, the downstream pressure begins to fall and the regulator opens. It continues to open further as more flow is needed until its maximum opening is reached. When the downstream pressure again reaches the set pressure, the regulator closes. Series PR pressure regulators are available in PVC, Polypropylene, PTFE and PVDF. Seals can be EPDM or FKM. For Series PRHM, inlet and outlet connections are NPT female threads.

Advantages of Plast-O-Matic PRHM Regulators
• Automatically regulate and prevent the downstream pressure from exceeding its set point   • Large surface area of its frictionless rolling diaphragm provides exceptional sensitivity to pressure fluctuations      • Downstream pressures settings adjustable from 5 to 125 psi   • Optional gauge ports to assist with setting and monitoring pressure   • Rugged construction with inlet pressures to 150 psi   • Seal concepts provide non-sticking design   • Control spring is isolated from liquid path

* PR series pressure regulators with a pressure setting range of 5 to 50 psi - request information on PH Series regulators.

Plast-O-Matic Series PRHM pressure regulators are designed to handle corrosive and ultra-pure liquids with inlet pressures up to 150 psi at 75°F. The standard downstream set pressure range is 5 to 125 psi; however, with special springs it can reach 75 psi. 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 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 liquid. This unique design, in conjunction with a pressure balanced shaft, assures smooth and stable control. Series PRHM pressure regulators prevent downstream pressure from exceeding the desired set pressure. The regulator will remain closed as long as the set pressure is maintained. As equipment or valves downstream of the regulator begin to open and demand flow, the downstream pressure begins to fall and the regulator opens. It continues to open further as more flow is needed until its maximum opening is reached. When the downstream pressure again reaches the set pressure, the regulator closes. Series PR pressure regulators are available in PVC, Polypropylene, PTFE and PVDF. Seals can be EPDM or FKM. For Series PRHM, inlet and outlet connections are NPT female threads.

Advantages of Plast-O-Matic PRHM Regulators
• Automatically regulate and prevent the downstream pressure from exceeding its set point   • Large surface area of its frictionless rolling diaphragm provides exceptional sensitivity to pressure fluctuations      • Downstream pressures settings adjustable from 5 to 125 psi   • Optional gauge ports to assist with setting and monitoring pressure   • Rugged construction with inlet pressures to 150 psi   • Seal concepts provide non-sticking design   • Control spring is isolated from liquid path

* PR series pressure regulators with a pressure setting range of 5 to 50 psi - request information on PH Series regulators.

Series RVDT In-Line Pressure Relief Valves feature a wetted flat PTFE diaphragm to resist both chemical attack and salt crystallization problems. A large, active diaphragm area provides for smooth, chatter-free operation. Relief setting is infinitely adjustable from 5 PSI to 100 PSI. This design functions as a relief valve, by-pass valve, back-pressure valve and anti-siphon valve. The Relief Function protects systems and equipment from over-pressure and pressure surges. The By-Pass Function prevents pumps from “dead-heading”. The Back- Pressure Function maintains necessary reverse pressure in closed-loop systems. The Anti- Siphon Function prevents unwanted chemical siphoning, if city water pressure drops to zero, and changes in elevation create negative pressure. Series RVDT relief valves are constructed of Type 1, Grade 1 PVC, CPVC, Polypropylene, PTFE or PVDF Kynar® body materials. The wetted diaphragm is PTFE, energized by a non-wetted Viton® diaphragm. Springs (not in wetted area) are zinc-plated steel, fasteners are stainless steel and the adjusting screw is polyethylene. 

Series RVDT In-Line Pressure Relief Valves feature a wetted flat PTFE diaphragm to resist both chemical attack and salt crystallization problems. A large, active diaphragm area provides for smooth, chatter-free operation. Relief setting is infinitely adjustable from 5 PSI to 100 PSI. This design functions as a relief valve, by-pass valve, back-pressure valve and anti-siphon valve. The Relief Function protects systems and equipment from over-pressure and pressure surges. The By-Pass Function prevents pumps from “dead-heading”. The Back- Pressure Function maintains necessary reverse pressure in closed-loop systems. The Anti- Siphon Function prevents unwanted chemical siphoning, if city water pressure drops to zero, and changes in elevation create negative pressure. Series RVDT relief valves are constructed of Type 1, Grade 1 PVC, CPVC, Polypropylene, PTFE or PVDF Kynar® body materials. The wetted diaphragm is PTFE, energized by a non-wetted Viton® diaphragm. Springs (not in wetted area) are zinc-plated steel, fasteners are stainless steel and the adjusting screw is polyethylene. 

Series RVT is an angle pattern design featuring a non-sticking Teflon® shaft passing through three U-cup seals. Venting between the upper and center U-cups results in Plast-O-Matic’s patented Fail-Dry® design for added protection. In the meantime the third seal continues to protect the control spring. The RVT design starts with 1/2" pipe size and runs through 2". Set pressures from 5 to 100 PSI. Once the relief valve is set, the valve will remain closed as long as the tank or line pressure does not reach the set pressure. The valve will begin to relieve when the set pressure is reached and will require an overpressure of approximately 40% to fully open. When the pressure falls below the set pressure, the valve will again close. Series RVT relief valves are constructed of Type 1, Grade 1 PVC, CPVC, Polypropylene, Teflon® or PVDF with solid Teflon® shaft. U-cup seals are EPDM or Viton®. The adjusting bolt, lock nut, control spring and fasteners are cadmium-plated steel. Stainless steel is available as an option.