Baker Hughes Masoneilan 41005 Series, Instruction Manual

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Masoneilan 41005 Series Globe Valves with API-6A Capabilities Instruction Manual
| 37 © 2023 Baker Hughes Company. All rights reserved.
2. Installation
2.1 Cleanness of Piping
Before installing the valve in the line, clean piping and valve
of all foreign material such as welding chips, scale, oil,
grease or dirt. Gasket surfaces must be thoroughly cleaned
to insure leak-free joints.
2.2 Isolating By-Pass Valve
To allow for in-line inspection, maintenance and
removal of the valve without service interruption,
provide a manually operated stop valve on each side
of the control valve and a manually operated throttling valve
in the by-pass line.
2.3 Heat Insulation
In case of heat insulated installation, do not insulate the
valve bonnet and take protection measures related to
personal safety.
2.4 Hydraulic Test and Cleaning of
Lines
During this operation, the control valve must not be used as
an isolating valve.
This means that the valve must always be opened before
carrying out pressure tests in the process line, cleaning of
pipes, etc., otherwise equipment damages or destroying of
seal rings could result.
2.5 Flow Direction
The valve must be installed so that the controlled substance
will flow through the valve in the direction indicated by the
flow arrow located on the body.
3. Disassembly
3.1 Removal of Actuator
(Figures 15 and 16)
Access to the internal components of the body should be
accomplished with the actuator removed. To carry out this
operation, follow the instructions below and refer to the
specific actuator instructions, reference 19530 for a type
87/88 actuator and 31188 for type 51/52/53 actuator.
3.1.1 Disconnection of instruments
Disconnect all mechanical couplings between the positioner
and the other instruments on the one hand and the valve
stem/actuator stem coupling on the
other hand.
3.1.2 Plug stems screwed into the actuator stem
In the case of air-to-retract actuators, apply sufficient air
pressure on the diaphragm to retract the stem completely.
Loosen the counter-nut, unscrew the stem.
During this operation, make sure that the plug does
not turn when it is seated. If the plug travel is very
small and there is a large amount of plug stem inside
the actuator, it may be necessary to remove the
yoke nut and lift the actuator so that the plug is not
touching the seat.
3.1.3 Stems attached with a stem connector
In the case of air-to-retract actuators, apply sufficient air
pressure on the diaphragm to retract the stem completely.
Loosen the screws and remove the stem connector.
3.1.4 Removal of actuator
Disconnect all the ingoing and outgoing air and electrical
connections from the actuator. Loosen the yoke nut or
attachment screws and lift the actuator, making sure
that the concentricity and/or the thread of the bonnet is not
damaged.
3.2 Opening of the Pressurized
Chamber (Figures 17, 18 and 19)
Prior to disassembly, vent the process pressure
and isolate the valve if necessary.
Note:
The valve must always be reassembled with
new packing rings and gaskets; before disassembly,
make sure that the appropriate parts are available.
A. Remove the packing flange nuts (B221) then remove
the packing flange/follower (B219).