Farris Engineering Valve 27FC26E-421/H2

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

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 and 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.

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)

Enter the test pressure to be held

Leakage Test for Air, Gas & Vapor Service Valves