Farris Engineering Valve 27GC12B-141/H1

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

Open Lifting Lever (Figure 1.5)

Remove wire seal and slide out button head rivet, releasing lever from cap.

Remove set screw from base of cap and lift cap off bonnet.

Holding the stem with pliers, remove stem jam nut and stem test washer.

Packed Lifting Lever (Figure 1.6)

Remove groove pin from lever and slide lever off the cam.

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 and adjust spring adjusting screw

Pop valve once more to ensure set pressure adjustment was not disturbed

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.

Remove wire seal and 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.

Remove the spring adjusting screw by turning counterclockwise.

Check applicability of backpressure test

Test secondary pressure zone for valves exceeding 1" inlet size

Verify tightness of all gasket joints and vent/drain plugs

Rework valve if leakage is detected

Describe rework actions taken if leakage was detected