What is a wafer check valve used for?

Wafer check valves are used in applications where it is essential to ensure fluid flow passes in only one direction. Wafer check valves can be mounted in vertical or horizontal directions, with the only restriction being a minimum back-pressure required to properly seat the check valve.

What is a fire check valve?

Pressure-activated check valves prevent contamination and flooding from water sources used in fire protection systems. A check valve is a device that permits the flow of semisolids, liquids, or gases in only one direction.

What is difference between swing type and wafer type check valve?

Wafer check valves are designed to fit into small spaces between two flanges, where swing check valves may not fit. One other major difference between swing check and wafer check valves is the wafer check valve restricts flow by a greater percentage than the swing check valve.

What is wafer type valve?

Wafer-Style Butterfly Valve Most wafer-style butterfly valves are engineered with four holes that align with the connected pipeline. The valve is designed to clamp between two flanges in your pipe work. Most wafer butterfly valves fit the majority of flange standards.

Can wafer check valves be installed vertically?

We hear many people ask, “Can swing check valves be installed vertically?” The simple answer to that question is yes, swing check valves can be installed in both directions.

What is OS & Y gate valve?

OS&Y means “outside stem and yoke” or “outside screw and yoke”. OS&Y gate valves operate by opening and closing via a gate, which lowers into or rises out of the valve. Raising the gate allows water to flow through the valve while lowering the gate cuts off the water flowing through the valve.

Why do I need an alarm check valve?

The alarm check valves help to minimize this level of corrosion by limited the pressure within the pipes until such time as it’s needed. Once activated, the alarm check valves will open, allowing the full pressure of water to fill the system.

What is the difference between lug and wafer?

Typically there are 8 or 12 lugs where 4 or 6 lugs are used to connect the each pipe section. Wafer type valves don’t have attachment lugs, though them may have alignment lugs. They are sandwiched between the flanges on the ends two lengths of pipe. To replace either length of pipe requires shutting the system down.

How to check for a bad PCV valve?

Locate the PCV valve. The PCV system was introduced in 1961.

  • Inspect the PCV system. The next step would be to inspect every component of the PCV system.
  • Test the PCV valve. There are different ways that you can test the PCV valve.
  • Clean or replace PCV valve.

    • How to replace the check valve?

    Schedule routine inspection and documentation of valve condition.

  • Perform non-destructive examination of valve seating surfaces and base metal pressure-containing components.
  • Maintain seating surface condition through a repair process such as the one described in this article.

    • How to check and adjust valves?

    Check all 4 valves on #1, the intake valves on #2, and the exhaust valves on #3. For each valve needing adjustment, remove the shim, measure it, make a note, and put it back in. NEVER TURN THE ENGINE WITH A SHIM OUT. Okay, next rotate the engine (clockwise only) 360 degrees (the cam rotates 180 degrees).

    How to install a PVC check valve?

    Check Valve Size. Before you purchase your swing check valve,make sure that you know the size and style you need.

  • Look Inside the Valve. Quickly taking a look inside the valve will ensure that nothing got stuck inside during shipping.
  • Check the Edges.
  • Confirm Placement of Valve.
  • Attach Swing Check Valve onto Pipeline.
  • Test the Valve.