Emerson A36 Installation, Operation And Maintenance Instructions

CASH VALVE A36 PRESSURE REDUCING OR PRESSURE BUILD-UP REGULATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Before installation, these instructions must be carefully read and understood.
DESCRIPTION
The Type A-36 regulator is a fully automatic
pressure regulating valve designed for
cryogenic service in the pressure build-up
circuit. Because it may be used for either
cryogenic liquids or gases, it may be installed
either before or after the pressure build-up
coil.
SPECIFICATION DATA
Service: Cryogenic liquids and gases
(pressure reducing or
pressure build-up service)
Sizes: ⅜"
Connections: Threaded internal inlet and
outlet
Body material: Bronze or Stainless Steel
Temperature
rating: +150°F (65°C) to
-320°F (-195°C)
Maximum
initial pressure: 600 psig (41.4 bar)
INSTALLATION INSTRUCTIONS
The Type A-36 regulator can be installed in
any position. For ease of maintenance and
reference however, it is suggested that the
valve be installed in a horizontal line with
the spring chamber upright. For convenient
operation and maintenance, manual shut-
off valves should be installed upstream and
downstream from the valve. Before installing
the valve, the piping should be throughly
flushed out to remove any foreign material.
Install the valve with the inlet pipe in proper
relationship to the flow arrow stamped on the
valve body.
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OPERATION INSTRUCTIONS
Adjusting the Delivery Pressure
The regulator's delivery pressure setting is
adjusted by turning the adjusting screw (1) at
the top of the spring chamber after loosening
the adjusting screw lock nut (2). To increase
the delivery pressure, turn the adjusting
screw clockwise (into the spring chamber).
To decrease the delivery pressure, turn the
adjusting screw counter-clockwise (out of the
spring chamber). Tighten the adjusting screw
lock nut after the adjustment has been made.
NOTE
When adjusting the delivery pressure, draw flow and
shutoff downstream to check pressure set.
MAINTENANCE INSTRUCTIONS
CAUTION
Before attempting to replace any spare parts,
be sure to shut off all pressure connections to
the valve. With the valve closed however, system
pressure could still be locked between the
shut-off valve and the inlet and/or outlet sides of
the regulator. Before proceeding with any valve
service, be certain to relieve the pressure from
both sides of the regulator.
1. Loosen Lock Nut ¼ turn and loosen
Adjusting Screw until the Pressure Spring
is no longer under tension. See Figure 1.
Note: When installing the Adjusting Screw
during re-assembly, tighten the screw
until the Lock Nut just touches the Spring
Chamber. When the Valve is placed in
service the pressure setting should be
very close to the original setting.
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2. Loosen and remove Spring Chamber (with
pressure spring) and bottom plug (with
piston spring). With screwdriver placed
in piston bottom slot, loosen and remove
lock nut on top of diaphragm. Disassemble
diaphragm and remove pusher post from
piston. Remove piston and pusher post
from valve.
3. Replace Diaphragm, piston, seat disc,
pusher post, and gaskets with components
included in Kit. Diaphragm and pusher post
gaskets must be given a very light coating
of Flourolube LG-120 or oxygen compatible
lubricant and installed between Body and
Diaphragm Assembly.
4. Retighten Spring Chamber to 50-60 ft/lbs.
torque.
5. Retighten Bottom Plug to approximately
125 in./lbs. torque.
Important: DO NOT OVERTIGHTEN.
6. Reset Adjusting Screw and tighten Lock
Nut - see NOTE in step 1.
VCIOM-15035-EN 20/08