Farris Engineering Valve 27DA23H-M20/S4

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)

Calculate and enter the test pressure for metal and soft seated valves

Leakage Test for Air, Gas & Vapor Service Valves

Enter the inlet size of the valve

Hold the pressure for the required duration based on inlet size

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

Check applicability of backpressure test

Test secondary pressure zone of 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

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.

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.