Farris Engineering Valve 27FA34H-F20/M1

Remove wire seal and slide out button head rivet

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

Hold the stem with pliers and remove stem jam nut and stem test washer

Reassemble all parts in reverse order

Packed Lifting Lever Disassembly

Verify valve type for backpressure test

Is the valve an open lever valve or does it have an exposed spring?

Enter the inlet size of the valve (in inches)

Is the inlet size greater than 1 inch?

Enter the test pressure used (in psi)

Is the test pressure at least 30 psi?

Apply leak detection solution to gasket joints and vent/drain plugs

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 pressure to be held (90% of CDTP if > 50 psig, or 5 psig below CDTP if ≤ 50 psig)

Leakage Test for Air, Gas & Vapor Service Valves

Ensure the use of appropriate test fluid

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

Does the valve open at the required pressure (CDTP)?

Reduce test drum pressure 25% below the opening pressure if necessary and adjust the 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.

Unscrew cap by turning counter-clockwise.

Hold the spring adjusting screw with a smooth jaw wrench and remove the jam nut.