Valves & Actuation

Series RVDM In-Line Pressure Relief Valves feature a primary rolling diaphragm and secondary flat diaphragm which incorporates the Plast-O-Matic patented Fail-Dry® design for added protection. If the rolling diaphragm should fail, liquid will weep through the vent port which is located between the two diaphragms. Leakage indicates maintenance is required and can be conveniently scheduled, eliminating an emergency shutdown.  Series RVDM valves are supplied with adjustment screws so that the user can make his own setting according to pressure requirements. Pressure settings can also be made at the factory to customer’s requirements. RVDM valves can be set from 5 to 100 psi (5 to 120 psi for 1/2" size) by simply turning the adjusting bolt.

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.

Engineered and Flow Tested for Superior Performance
Designed for quick, positive seal-off with minimum turbulence, low restriction and maximum fluid transfer, this industrial-grade ball check valve is used in a wide variety of industrial and chemical processing applications.
Heavy-Bodied PVC or CPVC Construction
Spears True Union Ball Check Valves never rust, scale or pit, providing exceptional chemical and corrosion resistance. Strong buttress-type threads on the union nuts allow higher pressure-handling capability and quick in-line installation and servicing.

• Spears computer-engineered design provides superior fluid flow with minimum turbulence. Eliminates “chatter” often encountered in ball check valves.
• Maximum Internal Pressure of 235 psi at 73°F for the most demanding applications of 1/2" - 4" valves.
• All Spears True Union Ball Check Valves are NSF Certified for potable water use. 

This solid, proven design is well suited for a variety of chemical, industrial and irrigation applications. Spears Gate Valves are feature-packed with multiple end connector options. Individual special features are found in each size range 1/2” through 2”, 2-1/2” and 3”, and in the full-featured Heavy Industrial 4” valve. Spears computer-engineered, heavy-bodied PVC or CPVC construction adds extra strength with superior chemical and corrosion resistance. 1/2” through 2” sizes are rated for 200 psi @ 73°F, 2-1/2” and 3” sizes are rated for 150 psi @ 73°F and 4” heavy-duty industrial gate valve is rated for 235 psi @ 73°F.

Features
• NSF approved for potable water service   • Suitable for vacuum service   • Rugged PVC or CPVC construction   • Available with either EPDM or Viton® seals   • Available with either socket or threaded ends          • Non-rising stem - reduces clearance issues   • 2-1/2” through 4” sizes available with flanged end connectors