Masoneilan 536V Back Pressure Microflow Regulators Instruction Manual | 2
Copyright 2021 Baker Hughes Company. All rights reserved.
Installation
Before installing, blow out line thoroughly to remove all foreign
matter which might foul the regulator.
Place the regulator vertically in a horizontal run of pipe so that
the controlled fluid will flow through the body in the direction
indicated by the arrow on the body or the words “IN & OUT”
marked on the connections. On steam service, the regulator
should be installed with the diaphragm chamber down so that
the diaphragm will be protected by a water seal. If installed
otherwise, an adequate water seal or seals must be provided.
A three valve by-pass around the regulators permits removing
the regulator from the line without shutting off the flow.
See figure 1 for typical installation diagram.
Pipe the controlled pressure from a convenient upstream point
in the line 6-10 feet (1,8 to 3 m) from the regulator to the 1/2”
NPT connection in the diaphragm case.
Install a gauge and a needle valve in the controlled pressure
line, to protect diaphragm case against any overpressure.
Description-Operation
The 536V Direct Operated Regulators are designed to maintain
a uniform upsteam pressure. Microflow bodies of regulators are
offered in single seat type.
The actuator of the 536V is a simple powerful mechanical
device. It is Air-to-Retract Stem type. The nominal range of an
actuator is the pressure range in pounds per square inch (psi)
in which the pressure setting can be obtained by adjustment.
Conformation of the diaphragm to the diaphragm plate (40) or
lower spring seat (34) serves as a flexible upper guide for the
actuator stem (26). Nylon reinforced neoprene diaphragms
permit smooth, sensitive operation. The packing box acts as a
lower guide for the actuator stem.
Note: On request, for special services, the nylon reinforced
neoprene diaphragm may be provided with PTFE coating.
The actuators are designated by the nominal range (psi).
See the following chart.
Needle 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.
Operation
The adjustable spring is set for the required controlled pressure.
This spring holds the plug closed. An increase in controlled
pressure above the set point retracts actuator stem and causes
regulators to open.
Variations in the controlled pressure thus cause the necessary
regulators movement to restore the controlled pressure to set point.
Plug and seat ring combination (trim)
Eight plugs and five seat rings can be used in combination
to obtain ten different plug and seat ring assemblies
(See Figure 2).
Each plug design and the seat ring orifice diameter permit to
identify parts in relation to figure 2.
The four plugs corresponding to trim Nos 6 to 9 differ by the
angle of the flat, machined on the point. The same seat ring
(3e) and the same spacer (3f) are used in the four cases.
See figure 2 to select the plug and seat ring combination to
obtain the required Cv.
Range (psi)
Case Size
0,5 - 3
11
2 - 5
9
3 - 15
5
10 - 40
5
30 - 85
5
60 - 170
5
Figure 1 - Typical Installation
No 536V Back Pressure Regulator
ROBINET
D'ISOLEMENT
Cv
Plug and
Seat ring No 9
0.004
to
0.0016
Plug and
Seat ring No 8
Plug and
Seat ring No 7
Plug and
Seat ring No 6
Plug and
Seat ring No 5
Plug and
Seat ring No 4
Plug and
Seat ring No 3
Plug and
Seat ring No 2
Plug and
Seat ring No 1
Plug and
Seat ring No 0
12a
12b
12c
12d
183
3 f
Orifice
Dia. 2mm
Orifice
Dia. 1,6mm
3e
3d
Orifice
Dia. 4,5mm
3c
Orifice
Dia. 9,5mm
3b
Orifice
Dia.
14,3
mm
3a
182
Cv
0.010
to
0.004
Cv
0.025
to
0.010
Cv
0.050
to
0.020
Cv
0.10
to
0.04
Cv
0.25
to
0.10
Cv
0.60
to
0.25
Cv
1.2
to
0.5
Cv
2.3
to
0.9
Cv
3.8
to
1.5
NEEDLE
VALVE
