Farris Engineering Valve 27FT15D-170/M1

Check applicability of backpressure test

Verify tightness of gasket joints and vent/drain plugs

Rework valve if leakage is detected

Mount the valve on the test stand

Attach a blind test fixture for air, gas & vapor service valves

Enter the cold differential test pressure (CDTP)

Enter the test pressure to be held

Leakage Test for Air, Gas & Vapor Service Valves

Verify all parts are grouped for assembly

Coat sealing surfaces with pipe thread sealant

Ensure sliding and bearing surfaces are clean and assembled without lubricants

Assemble disc in disc holder with V-notch facing stem radius

Insert assembly into guide and install body gasket on the body

Insert body into guide/disc holder assembly

Mount body/guide assembly in a vise

Place the valve at a suitable height on a clean and strong work surface.

Mount valve vertically in a vise using the flats on the valve body.

Unscrew cap by turning counter-clockwise.

Using a smooth jaw wrench, hold the spring adjusting screw and remove the jam nut.

Measure the distance from the top of the spring adjusting screw to the top of the bonnet, or count the number of turns of the spring adjusting screw.

Use appropriate test fluid as shown in Table 2

Mount valve on test stand and note set pressure and CDTP

Hold the stem tightly and tighten spring adjusting screw clockwise

Slowly raise test drum pressure and observe the opening (set) pressure

Is the set pressure within +/-3% tolerance?

Reduce test drum pressure 25% below opening pressure if necessary

Adjust the spring adjusting screw if necessary