2 | Baker Hughes
Copyright 2021 Baker Hughes Company. All rights reserved.
Introduction
Scope
The following instructions are designed to guide the user through
the installation and maintenance of the Masoneilan 77000 Series
control valves.
The Masoneilan 77000 Series is part of Baker Hughes’s
severe service portfolio, and may be custom designed to fit our
customer’s most difficult applications. This document provides
detailed installation and maintenance instructions for all sizes,
ratings and trim types used in the 77000 Series product line.
Serial Plate
The serial plate is usually fixed to the side of the actuator yoke.
It indicates information about the valve including size and type,
pressure class rating, body/bonnet material, and serial number.
After Sales Service
Baker Hughes offers After Sales Service comprised of highly
qualified technicians to support the installation operation,
maintenance and repair of its equipment. For support contact the
local Baker Hughes representative or Masoneilan factory located
closest to you.
Spare Parts
Only Masoneilan replacement parts should be used when
carrying out maintenance operations. Obtain replacement parts
through local Baker Hughes representatives or Masoneilan Parts
Department.
When ordering spare parts, the model and serial numbers
indicated on the manufacturer’s serial plate must be given. The
serial plate is on the side of the actuator yoke.
Actuator and Accessories
Actuators and other valve accessories have their own instruction
manuals, that provide information and details on the assembly
and installation. Refer to the appropriate instruction manual for
each unique accessory.
Numbering System
2nd
3rd
0
4th
0
5th
6th
2nd
7
1st
7
1st
Actuator Type and
action on air failure
Spring-Diaphragm
87 Spring-Diaphragm,
air to open (fail close)
88 Spring-Diaphragm,
air to close (fail open)
Piston Cylinder
52
Cylinder : Spring return,
air to open, single or
double acting (fail close)
53
Cylinder : spring return,
air to close, single or
double acting
(failure open)
51
Cylinder : double acting
without spring, air to
open or air to close
Body
Series
77 Multi-stage,
axial flow
labyrinth
trim control
valve
Trim
Type
0
Undefined
1 9-Stage Trim A
(1)
Unbalanced or
Partial-balanced
2 5-Stage Trim B
(1)
Unbalanced or
Partial-balanced
3 1-Stage Trim C
(1)
Unbalanced
4
5-Stage Trim X
Partial-balanced
5
3-Stage Trim Y
Unbalanced
Trim
Type
0
Undefined
1 Linear
Design
Series
0
Undefined
1 Bottom Entry
(1)
Legacy Bolted
Outlet
2 Top Entry
(1)
Legacy Bolted
Bonnet
3 Compact
Top Entry
Bolted Bonnet
Options
F
Forged Body
