Baker Hughes Masoneilan 77-6 User manual

Masoneilan™
77-6 Model
Air Lock-up Valve
Instruction Manual (Rev. B)
Baker Hughes Data Classication : Public

2 | Baker Hughes © 2019 Baker Hughes. 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, BAKER
HUGHES 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 BAKER HUGHES.
THE RIGHTS, OBLIGATIONS AND LIABILITIES OF BAKER HUGHES 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 BAKER
HUGHES REGARDING THE EQUIPMENT OR ITS USE ARE GIVEN OR IMPLIED BY THE ISSUE OF THESE
INSTRUCTIONS.
THESE INSTRUCTIONS 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 WITHOUT THE WRITTEN
APPROVAL OF BAKER HUGHES.

Masoneilan 77-6 Model Air Lock-up Valve Instruction Manual | 3© 2019 Baker Hughes. All rights reserved.
Safety Information
Important-PleaseReadBeforeInstallation
These instructions contain DANGER, WARNING, and
CAUTION labels, where necessary, to alert you to safety
related or other important information. Read the instructions
carefully before installing and maintaining your control
valve. DANGER and WARNING hazards are related to
personal injury. CAUTION hazards involve equipment or
property damage. Operation of damaged equipment can,
under certain operational conditions, result in degraded
process system performance that can lead to injury or
death. Total compliance with all DANGER, WARNING,
and CAUTION notices is required for safe operation.
CAUTION
CAUTION
WARNING
DANGER
This is the safety alert symbol. It alerts you to potential
personal injury hazards. Obey all safety messages that
follow this symbol to avoid possible injury or death.
CAUTION
CAUTION
WARNING
DANGER
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION
CAUTION
WARNING
DANGER
Indicates a potentially hazardous situation which, if not
avoided, could result in serious injury.
CAUTION
CAUTION
WARNING
DANGER
Indicates a potentially hazardous situation which, if not
avoided, could result in minor or moderate injury.
CAUTION
CAUTION
WARNING
DANGER
When used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, could
result in property damage.
Note: Indicates important facts and conditions.
About this Manual
• The information in this manual is subject to change
without prior notice.
• The information contained in this manual, in whole or
part, shall not be transcribed or copied without Baker
Hughes’s written permission.
• Please report any errors or questions about
the information in this manual to your local supplier.
• These instructions are written specifically for the 77-6
Model Air Lock-up valve control valves, and do not apply
for other valves outside of this product line.
Useful Life Period
The current estimated useful life period for the 77-6
Model Air Lock-up valve control valves is 25+ years. To
maximize the useful life of the product, it is essential to
conduct annual inspections, routine maintenance and
ensure proper installation to avoid any unintended stresses
on the product. The specific operating conditions will also
impact the useful life of the product. Consult the factory
for guidance on specific applications if required prior to
installation.
Warranty
Items sold by Baker Hughes are warranted to be free
from defects in materials and workmanship for a period
of one year from the date of shipment provided said
items are used according to Baker Hughes recommended
usages. Baker Hughes reserves the right to discontinue
manufacture of any product or change product materials,
design or specifications without notice.
Note: Prior to installation
The valve must be installed, put into service and
maintained by qualified and competent professionals who
have undergone suitable training.
All surrounding pipe lines must be thoroughly flushed to
ensure all entrained debris has been removed from the
system.
Under certain operating conditions, the use of damaged
equipment could cause a degradation of the performance
of the system which may lead to personal injury or death.
Changes to specifications, structure, and components
used may not lead to the revision of this manual unless
such changes

4 | Baker Hughes © 2019 Baker Hughes. All rights reserved.
Please read these instructions carefully BEFORE this
instrument is installed or maintained.
These converters are intended for use in industrial
compressed air systems only. Ensure that adequate pressure
relief provision is installed if application of system supply
pressure could cause downstream equipment to malfunction.
Installation should be in accordance with local and national
compressed air and instrumentation codes.
Products certified for use in explosion-proof or intrinsically
safe installations MUST:
a) Be installed in accordance with local and national codes
for hazardous area installations, and in accordance with
this manual.
b) Only be used in situations which comply with the
certification conditions stated in this handbook.
c) Only be maintained by qualified personnel with adequate
training on hazardous area implementation. Before using
these products with fluids other than air or for non-
industrial applications consult Baker Hughes.
Installation
Do not use for air pressures exceeding 250 psi.
Prior to installing, clean all lines thoroughly to remove all
dirt, scale or other foreign matter. Install the lock-up valve
in the controller output line as near to the control valve
diaphragm chamber as possible, holding the number of
connections to a minimum—so that the air flows through
the body in the direction indicated by the words INLET and
OUTLET marked on the underside of valve body.
The signal pressure line should be connected upstream
of the air supply regulator to provide effective response of
the lock-up valve in the event of air failure. Be sure all pipe
connections are tight.
Do not install this Air Lock-up Valve in air lines
which exceed 250 psi (1.72 MPa, 17.2 bar) pressure.
CAUTION
CAUTION
WARNING
DANGER
CAUTION
CAUTION
WARNING
DANGER
Adjustment
The lock-up valve is normally factory set (i.e., 20 psi for 3-15
psi operation or 35 psi for 6-30 psi operation) and should not
require adjustment. If, however, it becomes necessary to
adjust the setting an air supply, with a gauge and regulator,
should be piped to the signal pressure connection after: (1)
relieving compression on the range spring of the lock-up
valve; and (2) connecting the instrument output line to the
inlet connection of the lock-up valve.
Instrument output pressure need be sufficient only to
determine the open and closed position of the lock-up valve.
Turn the air supply pressure on until the pressure gauge
indicates the desired set pressure, then turn the adjusting
screw down until no air pressure may be felt coming from
the outlet of the lock-up valve. The valve will be fully closed
at this point.
Finally, tighten the adjusting screw locknut and connect:
(1) the lock-up valve outlet connection to the control valve
diaphragm chamber; and (2) the signal pressure line to the
signal pressure connection of the lock-up valve. Turn on
and set the air supply to operating pressure. Be sure that all
pipe connections are tight.

Masoneilan 77-6 Model Air Lock-up Valve Instruction Manual | 5© 2019 Baker Hughes. All rights reserved.
Maintenance
Due to their design and intended application, maintenance
difficulties are not expected to be encountered with these
valves. If they fail to perform in a satisfactory manner, it may
be due to accumulation of dirt in one or more of the parts.
If necessary to disassemble, proceed as follows, after:
(1) shutting off supply pressure; and (2) relieving spring
compression by backing off the adjustment screw.
Remove the four body cap screws (16); body cap (15), body
cap O-ring (14), range spring (3), upper spring button (2)
and spring case (9) will come free from body (7).
To free diaphragm S/A (10) and inlet valve S/A (12) from
the body, place the wrench on the insert retainer (13) and
unscrew from the body insert (5). Remove the body insert
O-ring (6) and slide the diaphragm S/A, the body insert and
the inlet valve S/A from the body. Holding the inlet valve
from turning, unscrew inlet valve locknut (4) and remove
diaphragm S/A from the inlet valve. Turn the inlet valve out
of body insert.
Check all ports to be sure they are clear of dirt. Inspect
the diaphragm S/A for rupture or for damage around the
edge. If necessary, install a new diaphragm S/A. Check the
inlet valve for wear. If the inlet valve is roughed-up or pitted,
replace with new one.
To reassemble the lock-up valve, perform all operations in
reverse order to that used in disassembly. Note: The O-ring
on the inlet valve stem should be lubricated before the inlet
valve is reassembled in the body insert.
Note: Considering the high labor costs involved in
replacing internal parts, it may be more economical
to stock complete units.
Prior to performing maintenance on the Air Lock-up
Valve, shut off the supply pressure and remove the
spring compression by backing off the adjustment
screw.
It is recommended that the Air Lock-up Valve be
removed from the line for repairs.
Ref. Qty Part Name Ref. Qty Part Name
1 1 Adjusting Screw 91 Spring Case
21Upper Spring Button 10 1Diaphragm S/A
31Range Spring 11 1 Inlet Valve O-Ring
41Inlet Valve Locknut 12 1 Inlet Valve S/A
51 Body Insert 13 1Insert Retainer
6 2 O-Rings 14 1 Body Cap O-Ring
71Body 15 1 Body Cap
81Locknut • 16 4Body Cap Screws
• Not visible in cutaway view.
Signal Pressure

6 | Baker Hughes © 2019 Baker Hughes. All rights reserved.
Notes

Masoneilan 77-6 Model Air Lock-up Valve Instruction Manual | 7© 2019 Baker Hughes. All rights reserved.
Notes

Copyright 2019 Baker Hughes Company. All rights reserved. Baker Hughes provides this information on an “as
is” basis for general information purposes. Baker Hughes does not make any representation as to the accuracy
or completeness of the information and makes no warranties of any kind, specic, implied or oral, to the fullest
extent permissible by law, including those of merchantability and tness for a particular purpose or use. Baker
Hughes hereby disclaims any and all liability for any direct, indirect, consequential or special damages, claims
for lost prots, or third party claims arising from the use of the information, whether a claim is asserted in
contract, tort, or otherwise. Baker Hughes reserves the right to make changes in specications and features
shown herein, or discontinue the product described at any time without notice or obligation. Contact your
Baker Hughes representative for the most current information. The Baker Hughes logo is a trademark of Baker
Hughes Company.
GEA31168B 12/2019
valves.bhge.com
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