GE 37 Series User manual

GE Oil & Gas
37/38 Series
Masoneilan*Spring-Diaphragm Actuators
Instruction Manual
GE Data Classification : Public

2 | GE Oil & Gas © 2014 General Electric Company. All rights reserved.

Masoneilan 37-38 Series Actuators | 3
© 2014 General Electric Company. All rights reserved.
THESE INSTRUCTIONS PROVIDE THE CUSTOMER/OPERATOR WITH IMPORTANT PROJECT-SPECIFIC REFERENCE
INFORMATION IN ADDITION TO THE CUSTOMER/OPERATOR’S NORMAL OPERATION AND MAINTENANCE PROCEDURES.
SINCE OPERATION AND MAINTENANCE PHILOSOPHIES VARY, GE (GENERAL ELECTRIC COMPANY AND ITS SUBSIDIARIES
AND AFFILIATES) DOES NOT ATTEMPT TO DICTATE SPECIFIC PROCEDURES, BUT TO PROVIDE BASIC LIMITATIONS AND
REQUIREMENTS CREATED BY THE TYPE OF EQUIPMENT PROVIDED.
THESE INSTRUCTIONS ASSUME THAT OPERATORS ALREADY HAVE A GENERAL UNDERSTANDING OF THE REQUIREMENTS
FOR SAFE OPERATION OF MECHANICAL AND ELECTRICAL EQUIPMENT IN POTENTIALLY HAZARDOUS ENVIRONMENTS.
THEREFORE, THESE INSTRUCTIONS SHOULD BE INTERPRETED AND APPLIED IN CONJUNCTION WITH THE SAFETY
RULES AND REGULATIONS APPLICABLE AT THE SITE AND THE PARTICULAR REQUIREMENTS FOR OPERATION OF OTHER
EQUIPMENT AT THE SITE.
THESE INSTRUCTIONS DO NOT PURPORT TO COVER ALL DETAILS OR VARIATIONS IN EQUIPMENT NOR TO PROVIDE FOR
EVERY POSSIBLE CONTINGENCY TO BE MET IN CONNECTION WITH INSTALLATION, OPERATION OR MAINTENANCE.
SHOULD FURTHER INFORMATION BE DESIRED OR SHOULD PARTICULAR PROBLEMS ARISE WHICH ARE NOT COVERED
SUFFICIENTLY FOR THE CUSTOMER/OPERATOR'S PURPOSES THE MATTER SHOULD BE REFERRED TO GE.
THE RIGHTS, OBLIGATIONS AND LIABILITIES OF GE AND THE CUSTOMER/OPERATOR ARE STRICTLY LIMITED TO
THOSE EXPRESSLY PROVIDED IN THE CONTRACT RELATING TO THE SUPPLY OF THE EQUIPMENT. NO ADDITIONAL
REPRESENTATIONS OR WARRANTIES BY GE REGARDING THE EQUIPMENT OR ITS USE ARE GIVEN OR IMPLIED BY THE
ISSUE OF THESE INSTRUCTIONS.
THESE INSTRUCTIONS CONTAIN PROPRIETARY INFORMATION OF GE, AND ARE FURNISHED TO THE CUSTOMER/
OPERATOR SOLELY TO ASSIST IN THE INSTALLATION, TESTING, OPERATION, AND/OR MAINTENANCE OF THE EQUIPMENT
DESCRIBED. THIS DOCUMENT SHALL NOT BE REPRODUCED IN WHOLE OR IN PART NOR SHALL ITS CONTENTS BE
DISCLOSED TO ANY THIRD PARTY WITHOUT THE WRITTEN APPROVAL OF GE.

4 | GE Oil & Gas © 2014 General Electric Company. All rights reserved.
Description
The spring-diaphragm actuator is a simple, powerful,
mechanical device. There are two general types:
Air-to-Extend Stem and Air-to-Retract Stem. Actuators
are designated by case size: Nos. 9, 11, 13, 15, 18
and 18L.
The nominal range of a spring-diaphragm actuator is
the air pressure range in pounds per square inch (psi)
for rated stroke under no load. Common ranges are
3–15 psi and 6–30 psi. The spring range and maximum
allowable supply pressure are marked on the serial
plate. For a 3–15 psi nominal range, the stem will start
to stroke when the air pressure reaches 3 psi, and will
complete the stroke when the pressure reaches 15 psi
(plus or minus 5%).
In the air-to-extend actuator, conformation of the
molded diaphragm to the diaphragm plate serves as
a flexible upper guide for the actuator stem (26). The
lower guide is an oil-impregnated bronze bushing (37)
located in the spring adjustor (36). The air-to-retract
actuator differs from the air-to-extend unit in that the
spring (22), spring barrel (71) and spring adjustor (36) are
located above the diaphragm plate (40) and diaphragm
(39) which are inverted. A gasket (19) at the joint of the
diaphragm case and yoke and a packing box around
the actuator stem prevents air leakage. The diaphragm
acts as a flexible upper guide and the packing box
assembly as the lower guide for the actuator stem.
Air connections are 1/4" NPT. Connections are located in
the upper diaphragm case (air-to-extend actuators) or
yoke (air-to-retract actuators).
Standard
Actuator Size
Effective
Diaphragm
Area (sq. in.)
Maximum
Stroke (in.)
945 ¾
11 71 1
13 105 1½
15 145 2
18 200 2½
18L 200 4
Maintenance
Air-to-Extend Actuators (Type 37)
Diaphragm Replacement. Before disassembling the
actuator, all spring compression should be relieved
by turning the spring adjustor (36), to prevent the
upper case popping up when the cap screws (45) are
removed. This is especially important on actuators
with a high initial spring setting. Remove cap screws
(45), nuts (46) and upper diaphragm case (43). Remove
nut (30) and washer (41) to release the diaphragm (39).
If possible, the replacement diaphragm should be of
the molded type supplied by Masoneilan, but in an
emergency a diaphragm may be cut from flat sheet
stock for up to and including No. 15 actuators. To allow
sufficient stroke without restriction due to flatness of
the diaphragm, the diaphragm bolt circle should be
about 10% greater than that of the diaphragm case.
Replace washer (41), nut (30) and upper diaphragm
case.
Spring Adjustment. An air supply, with a gauge and
regulator, should be piped to the upper diaphragm
case for this adjustment. Adjust spring compression so
that the actuator sem (26) just begins to move when
air pressure reaches minimum pressure of the range
stamped on the serial plate. This movement is most
easily detected by feeling the stem as air pressure is
applied. Note: Adjust spring compression only when
there is no air pressure on diaphragm.
Air-to-Retract Actuators (Type 38)
Diaphragm Replacement. The procedure is the same
as for air-to-extend actuators except that the entire
upper case assembly (including spring barrel (71), spring
(22), spring seats (33 and 34), nut (30) and diaphragm
plate (40) must be removed to release the diaphragm.
Install a new diaphragm and reassembly the above
parts.
Spring Adjustment. The procedure is identical with that
for air-to-extend actuators except that supply air is
piped to the 1/4" port in the yoke.
Packing Box. The packing box is subject to low air
pressure only and requires minimum maintenance.
The packing rings have a square section and are made
of carbon core with braided PTFE jacket. The packing
may be added to or completely replaced without
disassembling either the actuator or the mechanism (or
valve) to which it is attached. Be sure to tighten packing
nut (20) lightly. Over-tightening will cause excessive
friction, resulting in sluggish performance.

Masoneilan 37-38 Series Actuators | 5
© 2014 General Electric Company. All rights reserved.
Parts Reference
Ref.
No. Part Name Computer Abbrev.
Ref.
No. Part Name Computer Abbrev.
Ref.
No. Part Name Computer Abbrev.
**15
17
18
**19
20
21
22
22A
26
30
31
Gasket (packing box)
Yoke
Cap Screw (L case to yoke)
Gasket (L case to yoke)
Packing Nut
Snap Ring
Actuator Spring
Actuator Spring
Actuator Stem
Nut (actuator stem)
Packing Box
GASKET
YOKE
CAP SCR
GASKET
PKG NUT
SNP RNG
ACT SPR
ACT SPR
ACT STM
NUT
PKG BOX
**32
33
34
35
36
37
**39
40
41
43
44
Packing
Spring Seat (upper)
Spring Seat (lower)
Pipe Plug
Spring Adjustor
Bushing (spring adjuster)
Diaphragm
Diaphragm Plate
Diaphragm Washer
Upper Diaphragm Case
Lower Diaphragm Case
PACKING
USPR ST
LSPR ST
PIP PLG
SPR ADJ
BUSHING
DIAPHRM
DPH PLT
PDH WSH
U D CSE
L D CSE
45
46
56
57
70
71
72
73
74
Cap Screw (diaph. case)
Nut (diaph. case)
Travel Indicator Scale
Machine Screw
Ball and Retainer
Spring Barrel
Spring Barrel Cap
Ball Bearing Race
Cap Screw (SBL to U D CSE)
CAP SCR
NUT
T I SCL
MCN SCR
BALL & RTN
SPR BRL
SBL CAP
BBG RCE
CAP SCR
**Recommended spare parts
Air-to-Extend
Actuators
(Type 37)
Air-to-Extend
Actuators
(Type 38)
Case Nos. 9, 11 & 13 Case Nos. 15, 18 & 18L
Case Nos. 9, 11 & 13 Case Nos. 15, 18 & 18L

6 | GE Oil & Gas © 2014 General Electric Company. All rights reserved.
Notes

Masoneilan 37-38 Series Actuators | 7
© 2014 General Electric Company. All rights reserved.
Notes

GEA31171 04/2014
*Masoneilan is a registered trademark of the General Electric Company.
Other company names and product names used in this document are the
registered trademarks or trademarks of their respective owners.
© 2014 General Electric Company. All rights reserved.
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