PVC-U EPDM spring check valve for threading

PVC non-return valve

The check valve or non-return valve is a PVC accessory used to close the passage of a fluid flowing in only one direction of the installation. The operation is fully automatic by means of a spring that closes the passage and makes the fluid flow backwards.

These valves are used to maintain the pressure of the pipe that is in operation and on the other hand to block the opposite direction of flow.

Non-return valves are used for piping circuits such as plumbing, heating and pumping systems. They are mainly used to prevent water hammer, and especially in homes to avoid uncontrolled situations of water and waste. 

The right point to place the check valve in a system is near the end of the suction pipe, inside the tank and at the point opposite to where the pump is located. 

Features PVC-U check valves - Spring Series

• Can be used either vertically or horizontally
• 100% factory tested
• Easy installation and maintenance
• Resistance to multiple inorganic chemicals
• Excellent flow characteristics

Specifications spring check valve

• PVC-U body
• Female thread
• Metric series
• EPDM O-rings
• Blue marking: EPDM seals, to be chosen according to the fluid. 

Note: It is important to choose the type of valve according to the fluid and therefore to choose between EPDM or FPM (Viton) seals.

Dimensions PVC EPDM check valve threaded

The following table shows the outer diameter, the normal pressure, and the references of the PVC EPDM check valve for threading:

Consult the following table for the dimensions of the PVC EPDM check valve according to the outside diameter.

Components spring check valve

1. PVC-U body
2. PVC-U sealing cone
3. Spring stainless steel AISI 302 / PTFE coating
4. Nut PV-U
5. Connecting sleeve PVC-U
6. Cone seal EPDM / FPM
7. EPDM / FPM sleeve gasket
8. Gasket holder PVC-U
9. EPDM / FPM body gasket

Assembly instructions 

1. Loosen the nuts on the valve and separate them from the sleeves.
2. Insert the nuts into the pipes and fix the sleeves on the pipe ends.
3. Use PVC-U or rigid PVC-C pipe adhesive for the joints to be glued and do not apply pressure until 1 hour per bar.
4. In the joints to be threaded, place PTFE tape on the male threads.
5. Place the valve between the sleeves and tighten the nuts on the valve.

Pressure/temperature diagram