User manual

Instructions for Use
If Valve Will not Close Leak-Tight
1
Variable Leak Valve User Manual / 87-400-085-01 (D) 21/36
If Valve Will not Close Leak-Tight
If the valve is not leak-tight across the sapphire-gasket seal after the
knobs have been turned to the stop position, one of several problems
may be the cause.
1. The gasket has been compressed and the stops must be reset.
2. The valve, sapphire, and/or gasket are contaminated and need
cleaning.
3. The gasket is scratched, nicked, or compressed beyond further
use and must be replaced.
4. The sapphire is fractured and must be replaced.
The following procedures should be followed in the order listed.
a Follow the steps outlined in para. “To establish a new stop
position”.
If the valve is still not leak tight, proceed to step "b" below.
b Disassemble, clean, and inspect the sealing components.
Particles, oxide on the gasket, or other contaminants may
prevent the valve from closing leak-tight. Disconnect the valve
from other components and disassemble. Inspect and clean the
valve, sapphire, and gasket as described in the following steps.
Disassemble
Refer to the figure “Variable leak valve assembly drawing”.
a Turn both knobs counterclockwise four turns.
b Carefully remove the pressed-in hole cover (11) and with a 5/16”
Allen wrench loosen the roughing screw two turns.
c Use a clean 1/4" Allen wrench to remove the gasket assembly (1).
The thread is normal right hand and 20-25 ft.-lbs. of torque will
be required to loosen it.
d Clean the sapphire removal tool with acetone, insert it into the
hole that held the gasket assembly, and engage the fingers of the
tool with the slots on the periphery of the sapphire assembly.