User manual

Instructions for Use

Adjustment of Handle Position

20/36 Variable Leak Valve User Manual / 87-400-085-01 (D)

Adjustment of Handle Position

As described previously, continual reduction in gasket height

necessitates resetting of the stop position and eventual readjustment

of handle position. When the angle between the handle and body at

point of closure has changed from its original parallel (approximate)

position to an angle of +/-5°, the valve should be readjusted. This

adjustment will maintain a proper relationship between handle travel

and the size of the leak.

1. Set handle.

Turn the locked knobs counterclockwise until the valve handle is

approximately parallel to the side of the valve body.

2. Close valve using roughing screw as follows.

a Carefully remove the hole cover from the top of the valve.

CAUTION!

Do not exceed 8 ft.-lbs. or torque or the sapphire may be fractured.

b With a 5/16” Allen wrench, tighten the roughing screw to 6 ft.-lbs.

of torque.

c Replace the hole cover.

d The valve should now be leak-tight, but this can be determined

reliably only with a leak detector. If the valve leaks across the

seal, refer to the following paragraph.

e Adjust knobs as follows.

f Turn the knobs together counterclockwise until a leak is

generated.

g Turn the knobs clockwise until the valve is closed leak-tight.

h Turn the knobs two additional turns clockwise to provide the

proper amount of overdrive.

i Loosen the knobs without allowing the fine-drive screw to turn

then turn the inner knob clockwise until the collar is against the

handle. Lock the outer knob against the inner one.

j Two counterclockwise turns of both knobs together should open

a leak.