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Block Valves: Instruction Manual for All Sizes
D
R
A
FT 9/
21
/04
1-5
1.2 Operation
This section discusses the operation of:
❑
❑
“Pneumatically-Operated Valves”
1.2.2 Manually-Operated Valves
The manual valve operates by means of a hand-actuated knob.
To close the valve:
❑
Turn the knob in a clockwise direction. To properly compress the main O-ring seal
and obtain a good vacuum seal, turn the knob clockwise until a slight resistance is
felt, then firmly torque the knob approximately ¼ turn.
To open the valve:
❑
Turn the knob counterclockwise until the valve is fully open to ensure maximum
conductance.
1.2.3 Pneumatically-Operated Valves
Pneumatic valves are spring-closed air-opened valves.
When electric power is:
❑
Supplied
to the solenoid valve, air is supplied to the cylinder and the valve opens.
❑
Removed
, the valve closes (Figure 1-3).
Figure 1-3
Solenoid Operation
P
ress Center
for Manual Operation
Air Supply for
Normally Closed Operation
To Valve
Exha
ust
Содержание L6280
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