Watts SCV 1/8 R Check Valve, NPT

The Watts SCV 1/8 R is a 1/8" silent spring check valve with NPT connections. It permits flow in one direction and closes against reverse flow.

This 1/8 inch service check valve is used in heating applications between boiler piping and system components to facilitate the servicing of components under pressure, such as thermal expansion tanks and float vents, without draining the piping. As the component is threaded into the service check valve, the spring loaded valve opens to system pressure. As the component is removed, the valve closes, maintaining system integrity while the component is being inspected.

Features

• Facilitate the servicing of components under pressure
• Spring loaded valve
• For boiler applications
• Easy to use

Common Questions

Can I install it vertically?

Yes. The SCV 1/8 R is rated for horizontal or vertical lines because the spring, not gravity, closes the disc. In a vertical run the flow must be upward through the valve, following the body arrow.

Will it slam or cause water hammer?

No. The spring closes the disc before the flow actually reverses, so the valve seats silently instead of being slammed shut by the returning column of water. That is the point of a silent (non-slam) check.

Does it come with a strainer?

No. This is an inline check valve only. If the line carries debris, install a strainer upstream — grit on the seat is the usual cause of a check valve weeping by.

Is it potable rated?

No. This model is not certified lead-free, so it is not for potable-water piping — it is specified for hydronic heating service. Watts LF-prefixed check valves cover potable applications.

Specifications

• Type: Check
• Size: 1/8"
• Connection: NPT
• Application: Hydronic Heating
• Pack Quantity: 50
• Country of Origin: Taiwan
• Warranty: 1 Year Limited
• MPN: SCV 1/8 R
• Lead-Free: No
• Check Mechanism: Spring (Silent)
• Installation Orientation: Horizontal or Vertical
• Silent / Non-Slam: Yes
• Integral Strainer Included: No