Masoneilan 31000 Series Control Valve Instruction Manual | 2
Copyright 2020 Baker Hughes Company. All rights reserved.
1. Introduction
The following instructions are designed to assist maintenance
personnel in performing most of the maintenance required on
the 31000 Series valve and, if followed carefully will reduce
maintenance time.
Spare Parts
When performing maintenance always use Masoneilan
replacement parts. Parts are obtainable through your local Baker
Hughes Representative or sales office. When ordering parts,
always include Model and Serial Numbers shown on serial plate.
The use of the assembly tools is recommended to simplify
disassembly and reassembly work. These are listed in Figures
2 and 3 and can be obtained from Baker Hughes Masoneilan
parts department.
Service
Baker Hughes has highly skilled service technicians available
to assist you in the operation, start-up, maintenance and repair
of our valves and component parts. Contact your nearest Baker
Hughes Representative or sales office.
Training
Baker Hughes regularly holds training programs to train
customer service and instrumentation personnel in the
operation, maintenance and application of our control valves
and instruments. To participate in one of these training sessions
contact your local Baker Hughes Representative.
2. General
The statements and information given in these operating
instructions apply to all sizes in the 31000 Series control valves.
The model number, size and rating of the valve are shown on the
serial plate. Refer to numbering system hereafter to identify the
valve model.
3. Principle of Operation
The concept of the 31000 Series is based on the proven rotating
plug principle:
• The valve plug, which forms one unit with the valve shaft,
can rotate eccentrically in a free flow design, flanged valve
body. The seating surface of the plug has the shape of a
segment of a sphere.
• The midpoint of the spherical seating surface lies
eccentrically to the axis of the shaft so that there is no
contact between seat and plug even when the valve is only
partially opened. Wear is reduced to a minimum.
• Excellent sealing in the seat/plug closure is achieved by the
use of PTFE and PFA, provided as a standard feature on the
31000 Series. The seat is fixed in the valve body through its
conical outside shape. The plug shaft is connected to the
actuator with the help of a lever. The actuator is operated by
means of a rolling diaphragm with opposing spring.
Numbering System
—
1st
2nd
1st
2nd
3rd
4th
5th
3
1
0
Actuator Type
35 Spring-opposed
rolling-diaphragm
Body
Series
31
Actuator Mounting
(Type 35 Only)
1 Parallel to pipeline, air to
close
2 Parallel to pipeline, air to
open
Seat
Material
1 PTFE
2 Special
Not As-
signed
0
—
Note:
Actuator positions 1 and 2 are standard configurations.
View seen from actuator end. Other positions are available:
consult Baker Hughes.
