Baker Hughes Masoneilan 525, Instruction Manual

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3 | BHGE © 2018 Baker Hughes, a GE company. All Rights
Reserved.
(2) Upstream Pressure Controlled (See Figure 1b)
5. Installation
Before installing, blow out line thoroughly to remove all
foreign matter which might foul the valve. Place the
regulator in a horizontal run of pipe so that the controlled
fluid will flow through the valve in the direction indicated
by the arrow on the valve body or the words IN and OUT
marked on the connections. On steam service, the valve
should be installed with the diaphragm actuator down so
that the diaphragm will be protected by a water seal. If
installed otherwise, an adequate water seal must be
incorporated.
Pipe the controlled pressure from a convenient point in
the line 6-10 feet from the regulator (or in the discharge
line
6-10 feet from the pump on pump pressure applications)
to the ½'' NPT connection in the diaphragm case. Install a
gauge and a needle valve in the control line. The valve
permits shutting off the control line and also serves as an
adjustable choke to prevent cycling of the regulator,
which may result from the pulsation of a pump in the
system.
A three-valve bypass around the regulator permits
removing the regulator from the line without shutting
down the system.
6. Adjustment
When pressure setting is specified, the regulator is set
accordingly at the factory; otherwise it is set at the
minimum of the range shown on the serial plate.
Open stop valve on the outlet side of the regulator and
partially open stop valve on the inlet side, allowing
pressure in the system to build up slowly. Then open
control line valve and check setting by means of the
gauge. To increase pressure setting, turn adjusting screw
clockwise to compress the spring. To decrease the setting,
turn adjusting screw counterclockwise to relieve spring
compression. Fully open stop valve on the inlet side of the
regulator.
7. Body Disassembly
Access to the internal components of the body should be
accomplished with the actuator removed. To remove the
actuator from the body, refer to the actuator instruction
GEA31593 for 10900 Series Actuators.
Prior to performing maintenance on the valve, isolate the
valve and vent the process pressure.
7.1 525 (Reducing Service)
After removing the actuator, disassemble the body using
the following procedure:
A. If there is a leak detector connection on the
lateral NPT port of the bonnet, disconnect this
piping as well.
B. Remove body stud nuts (21).
C. Remove bonnet (10), and plug stem (5) and plug
(4) sub-assembly together as one unit.
NOTE: Spiral wound body gaskets (22) are standard in the
500 Series design and it is imperative that a new gasket be
installed each time the valve is disassembled.
D. Remove packing flange stud nuts (15), packing
flange (13) and packing follower (12).
E. Remove plug (4) and plug stem (5) sub-assembly
from the bonnet (10).
Care must be taken to avoid damage to the plug and plug
guide.
F. Remove old packing (16) [and optional lantern
ring (17) if a leak detection connection has been
installed]. Refer to Figure 2.
G. Remove blind head (9) [including lower
bushing(23)]
NOTE: Spiral wound body gaskets (22) are standard in the
500 Series design and it is imperative that a new gasket be
installed each time the valve is disassembled.
H. Bonnet (10), plug (4), bushings (23) and seat rings
(2 & 3) may now be inspected for wear and
service damage. After determining the
maintenance required, proceed to the
appropriate Section of this instruction manual.
7.2 526 (Back Pressure Service)
After removing the actuator, disassemble the body using
the following procedure:
A. If there is a leak detection connection on the
lateral NPT port of the bonnet, disconnect this
piping as well.
B. Remove body stud nuts (19).
C. Remove packing flange stud nuts (15), packing
flange (13) and packing follower (12)
D. Remove bonnet (10)
E. Remove blind head (9) [including lower
bushing(23)]
NOTE: Spiral wound body gaskets (22) are standard in the
500 Series design and it is imperative that a new gasket be
installed each time the valve is disassembled