Farris Engineering Valve 27ET25E-M71/N1

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)

Does the valve exceed 1" inlet size?

Enter the test pressure used (must be at least 30 psi)

Use a suitable leak detection solution to verify tightness of all gasket joints and vent/drain plugs

Use appropriate test fluid as shown in Table 2

Mount valve on test stand and note set pressure and CDTP

Hold stem tightly and tighten spring adjusting screw clockwise

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

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

Reduce test drum pressure 25% below opening pressure if necessary

Adjust spring adjusting screw if necessary

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.

Hold the stem with pliers (wrap the jaws to avoid marring), 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 and remove the jam nut.