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Section 1.0
Introduction
General Information
The Parker Autoclave Engineers' Service RVP & RVS
Relief Valves for gas and liquid service are designed to
protect systems and components against over-pressure
and to reclose after normal pressure conditions are
reached.
Safety
The Parker Autoclave Engineers Relief Valve is factory
tested for structural integrity and functionality. The valve's
relieving pressure is pre-set at the factory and is sealed
with a wire tie to assure proper valve operation when
installed. The valve is also tagged with set pressure and a
maximum allowable working pressure and temperature.
Note that the relief valve flow characteristics are defined
at an allowable accumulation of 10% over set pressure.
It is good engineering practice to further protect against
over-pressure with a rupture disc of sizeable area.
Section 2.0
Installation
Inlet Piping
The relief valve should be mounted in the vertical position
and secured with mounting screws (customer supplied).
The inlet tubing to the valve should be unobstructed and
as short as possible between the item being protected
and the relief valve. Valves other than the relief valve
should not be permitted in the relief line. Do not mount
with outlet in upward position. The inlet tubing should
have an inside diameter of at least that of the relief valve
nozzle, but never less than the calculated minimum
required relieving area. All tubing should be clean and
free of foreign matter and the connection to the valve
should be clean and well-lubricated with and anti-galling
substance (e.g., Jet Lube SS-30) before installation.
The inlet connection should be tightened to the recom-
mend torque value listed in Parker Autoclave's Valve
Fitting and Tubing Catalog.
PARKER AUTOCLAVE ENGINEERS FLUID COMPONENTS RESERVES THE RIGHT
TO ALTER THE SPECIFICATIONS GIVEN IN THIS PUBLICATION IN LINE WITH
OUR POLICY OF CONTINUOUS IMPROVEMENT.
ALL GENERAL TERMS AND CONDITIONS OF SALE, INCLUDING LIMITATIONS OF
OUR LIABILITY, APPLY TO ALL PRODUCTS AND SERVICES SOLD.
Inlet Piping
The discharge piping from the relief valve should be direct
and unobstructed. Where possible, a short discharge pipe
is desirable. However, if this is impractical, consideration
of back pressure must be made by the customer. In any
case, the discharge pipe should be at least the same
inside diameter as the relief valve discharge port.
Section 3.0
Disassembly
NOTE: In the event that the valve needs to be disassembled for repairs, it should be
sent backto the factory since the warranty will be voided if the cable seal is broken.
The following procedures should only be used if the warranty has expired. Refer to
Figure 1 for part locations on the RVP valve. For RVS valves, refer to Figure 2.
3.1 Cut the cable, then remove the cap.
3.2 Loosen the locknut on the adjusting bolt and
turn the adjusting bolt counter-clockwise until
all compression is relieved on the spring.
3.3 Loosen the spring cylinder locknut and remove
the spring cylinder using a spanner wrench.
3.4 Remove the top spring washer, spring and the
botom spring washer from the shaft.
3.5 Remove the spindle from the plug.
3.6 Remove the plug and plug guide from the body.
3.7 Remove the plug from the plug guide by remov-
ing the locknut. For RVS relief valves, remove
the locknut from the plug gland and unscrew the
plug gland from the plug guide using a 1/4" allen
wrench. Then, remove the plug from the plug
guide.
3.8 Remove the seat gland and the seat.
3.9 Inspect all parts for damage, especially the seat
and plug. Replace as required.
Section 4.0
NOTE: Lubricate all threads with Jet Lube SS-30 or other appropriate lubricant.
Refer to the Parker Autoclave Engineers VFT lubrication guide.
4.1
Place the valve body into a vise.
4.2
Insert the seat into the body and screw in the
seat gland.
4.3
Torque the seat gland to 75 ft-lbs. (101.7 N.M)
4.4
Place the plug into the plug guide so the plug
threads extend out of the top of the plug guide.
For RVS valves, first place the plug in the plug
guide as shown in Figure 2, then screw in the
plug gland using a 1/4" allen wrench.
3
Assembly
Parker Autoclave Engineers
Instrumentation Products Division
Erie, PA USA
www.autoclave.com | Cat. 02-0031ME
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