Farris Engineering Valve 27DA35E-321/H2

Check applicability of backpressure test

Confirm exclusion of open lever valves and valves with exposed springs

Test secondary pressure zone of valves exceeding 1" inlet size

Verify tightness of all gasket joints and vent/drain plugs using leak detection solution

Rework valve if leakage is detected

Document any issues found during the test

Refer to Figure 1.2 for construction details

Refer to Figures 1.5 and 1.6 for open lever and packed lever cap construction details

Verify that all parts required are grouped for assembly

Visually inspect all parts for cleanliness and imperfections

Check guide for dirt or scale in exit holes and undercuts

Ensure guide surface is in good condition

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)

Set the pressure to 90% of CDTP if CDTP > 50 psig, or 5 psig below CDTP if CDTP ≤ 50 psig

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.

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.

Hold the spring adjusting screw with a smooth jaw wrench.