Corken B177-2 Instruction manual

Installation, Operation
& Maintenance Manual
Model B177 External Automatic Bypass Valve
Model B177 External
Automatic Bypass Valve
Warning: (1) Periodic inspection and maintenance of Corken products is essential. (2) Inspection, maintenance and installation of Corken products
must be made only by experienced, trained and qualied personnel. (3) Maintenance, use and installation of Corken products must comply with
Corken instructions, applicable laws and safety standards (such as NFPA Pamphlet 58 for LP-Gas and ANSI K61.1-1972 for Anhydrous Ammonia).
(4) Transfer of toxic, dangerous, ammable or explosive substances using Corken products is at user’s risk and equipment should be operated
only by qualied personnel according to applicable laws and safety standards.
ORIGINAL INSTRUCTIONS IH102E
Solutions beyond products...

Warning
Install, use and maintain this equipment according to Corken’s instructions and all applicable federal, state, local laws
and codes. Periodic inspection and maintenance is essential.
Corken One Year Warranty
CORKEN, INC. warrants that its products will be free from defects in material and workmanship for a period of one
year from date of installation, provided that the warranty shall not extend beyond twenty-four (24) months from the date
of shipment from CORKEN. If a warranty dispute occurs, the DISTRIBUTOR may be required to provide CORKEN
with proof of date of sale. The minimum requirement would be a copy of the DISTRIBUTOR’S invoice to the customer.
CORKEN products which fail within the warrant period due to defects in material or workmanship will be repaired
or replaced at CORKEN’s option, when returned, freight prepaid to CORKEN, INC., 9201 North I-35 Service Road,
Oklahoma City, OK. 73131.
Parts subject to wear or abuse, such as mechanical seals, blades, piston rings, valves and packing, and other parts
showing signs of abuse, neglect or failure to be properly maintained are not covered by this limited warranty. Also,
equipment, parts and accessories not manufactured by CORKEN but furnished with CORKEN products are not
covered by this limited warranty and the purchaser must look to the original manufacturer’s warranty, if any. This limited
warranty is void if the CORKEN product has been altered or repaired without the consent of CORKEN.
All implied warranties, including any implied warranty of merchantability or tness for a particular purpose, are
expressly negated to the extent permitted by law and shall in no event extend beyond the expressed warrantee period.
CORKEN DISCLAIMS ANY LIABILITY FOR CONSEQUENTIAL DAMAGES DUE TO BREACH OF ANY WRITTEN OR
IMPLIED WARRANTY ON CORKEN PRODUCTS. Transfer of toxic, dangerous, ammable or explosive substances
using CORKEN products is at the user’s risk. Experienced, trained personnel in compliance with governmental and
industrial safety standards should handle such substances.
Contacting the Factory
Before you contact the factory, note the model number and serial number of your pump. The serial number directs
us to a le containing all information on material specications and test data applying to your specic pump. When
ordering parts, the Corken service manual or Operations, Installation and Maintenance (IOM) manual should be
consulted for the proper part numbers. ALWAYS INCLUDE THE MODEL NUMBER AND SERIAL NUMBER WHEN
ORDERING PARTS.
The model and serial numbers are shown on the nameplate of the unit. Record this information for future reference.
Model No.
Serial No.
Date Purchased
Date Installed
Purchased From
Installed By
2

Table of Contents
APPLICABLE NOTICES FOR ATEX 2014/34/EU CONFORMITY ........................................4
FEATURES OF THE B177 EXTERNAL AUTOMATIC BYPASS VALVE ...................................5
INSTALLATION OF THE B177 EXTERNAL AUTOMATIC BYPASS VALVE ...............................5
Operation of the B177 External Automatic Bypass Valve ..............................................5
APPENDICES
A. Model Number Identication Code and Available Options ...........................................7
B. Specications .............................................................................8
C. Performance ..............................................................................8
D. Outline Dimensions .........................................................................9
E. Parts Details .............................................................................10
3

Applicable Notices for ATEX
2014/34/EU Conformity
Product Type:
Corken Liquid Transfer Bypass Valves
Model Covered:
B177
Intended Application:
The bypass valve models covered by this manual conform to
the European Union ATEX 2014/34/EU Directive for explosive
gas atmospheres and transfer of liqueed gases such as
Liqueed Petroleum Gas, anhydrous ammonia, freons, etc.
Possible Misuse Warning:
The designated bypass valve models must only be
installed in systems designed for its intended use, similar
to the examples presented in this manual.
ATEX Classication:
Group II; Category 2; G; Temperature Class T4 – T5
These products are classied under the ATEX directive
as Equipment – Group II – Category 2 – equipment is
intended for use in areas where explosive atmospheres
caused by gases or vapors (G) may be present. The
surface Temperature Class rating is a range between T4
275°F (135°C) and T5 212°F (100°C).
Nameplate:
Training Instructions:
Instructions for the safe application and use of this product
are provided in this manual. Read this manual completely
prior to installation and use of this product. Only qualied
and properly trained personnel should be allowed to install,
operate, and maintain this equipment.
Mechanical Ignition Sources:
The bypass valve is installed as part of an assembly including
the pump and the entire system must be grounded to prevent
possible electrostatic discharge. Installation and adjustment
guidelines are provided in this manual and are to be followed
for the proper operation and performance of the valve.
Sound Levels:
These products are reactionary devices used in pumping
systems. Sound levels are highly dependent upon the
application, product being pumped, and installation. When
operating in the system the valves should have a noise
level no higher than 80 dBA.
Piping Forces and Moments:
Maximum Allowable Nozzle Forces and Moments
Note: Piping systems should be designed according to
standard engineering practice and applicable national
and local codes. NO piping induced forces or moments
are recommended for Corken B177 bypass valves.
X—Horizontal (perpendicular to valve discharge port)
Y—Vertical
Z—Horizontal (parallel to valve discharge port)
Fx = Fy = Fz = 42 lb (19 kg)
Mx = My = Mz = 70 ft•lb (10 kg•m)
Notice!
Corken bypass valves should only be installed in LPG
& NH3systems that have been designed by qualied
engineering personnel and operated and maintained
by qualied technicians. The system must conform to
all applicable local and national regulations and safety
standards (specically, LPG systems must conform to
NFPA 58). This manual must be kept with the bypass
valves and be reviewed before installing, operating or
performing any maintenance work.
Warning!
Do not attempt to open the pump or bypass valve until you
have bled off the pressure. High pressure in the system
can cause personal injury and/or property damage.
Please note: if the system contains a meter, the differential
valve will keep liquid under pressure in the pump, meter
and piping even after the hose has been emptied.
File number
ATEX
directive
Explosion
protection
ATEX Directive
2014/34/EU marking
Equipment classified
as Group II—Catagory 2
Explosion gas atmosphere
high level
Surface temperature range
T4 (135°C) 275°F
4

Features of the B177 External
Automatic Bypass Valve
The CORKEN B177 external bypass valve is designed to
maintain a constant differential pressure across a sliding
vane pump or any other piece of equipment requiring
differential pressure control. Since horsepower is directly
related to the amount of differential pressure generated by
a sliding vane pump, limiting pressure limits horsepower.
This is particularly important on electrically driven pumps
used to load or unload product from bobtails or transports. If
a valve is inadvertently closed, it can overload the motor or
cause the pump to build too much pressure. To prevent this
from happening, an external bypass valve is installed in the
piping system.
To ensure optimum performance of the external bypass
valve and the entire pumping system, follow the instructions
in this manual.
Installation of the B177 External
Automatic Bypass Valve
The B177 external bypass valve may be installed in either
a vertical or horizontal position. Figure 1.1 illustrates how
the B177 is installed as a pump differential bypass valve.
The minimum size of the inlet and outlet piping should not
be smaller than the opening of the external bypass valve.
The outlet piping of the external bypass valve should return
to the liquid or vapor section of the storage tank. Do not
connect the outlet piping of the external bypass valve
to the inlet piping of the pump.
NOTE: A balance line must connect the valve bonnet
to the storage or supply tank. The minimum size for the
balance line is indicated in the following table.
Valve Model Minimum Balance Line Tubing Size
B177-2
B177-2.5 1/2"
Operation of the B177 External
Automatic Bypass Valve
The differential pressure setting of the B177 external bypass
valve is adjustable. The range of differential pressure
depends on the size of the spring installed in the bypass
valve. When the bypass valve ships from the CORKEN
factory, a tag identifying the spring size is attached to the
valve bonnet. The table below shows the part number
and differential pressure range for each spring. All of the
springs are interchangeable with each valve size.
Valve Model Spring Number Differential
Pressure (PSIG)
B177-2
B177-2.5
1783 10 –40
1785 30–80
1786 8 0 –110
1786 -1 100–125
Figure 1.1: Typical installation.
5

Stationary pump applications equipped with an
electric motor drive:
1. Install liquid-lled pressure gauges equipped with a
needle valve or snubber in the following locations:
a. Pump discharge gauge port or inlet side of the
bypass valve.
b. Supply tank and/or pump suction.
2. Attach an ammeter to a motor lead of the electric motor.
3. Adjust the B177 external bypass valve to the lowest
pressure setting by turning the adjusting stem fully
clockwise until the spring tension is no longer present.
4. Make sure the shut-off valves on the pump discharge
line and bypass return line are in a fully open position.
5. Start the pump and circulate the liquid back to the
supply tank using the discharge line.
6. Slowly close the shut-off valve located on pump
discharge line so all of the liquid ows through the
external bypass valve.
7. Slowly increase the setting of the B177 external
bypass valve by turning the adjustment stem
counterclockwise until the ammeter indicates the
full-load current indicated on the motor nameplate or
required differential pressure is reached. Record the
pressure on the gauge mounted on the inlet side of
the bypass valve.
8. If the pump has an internal relief valve, the B177
external bypass valve should be set at least 20–25 psi
(1.38 to 1.72 bar) below the setting of the pump’s built
in relief valve. Following this guideline ensures the
liquid does not recirculate through the internal relief
valve and eliminates the possibility of erratic “hunting”
between the two valves.
9. If possible the setting of the B177 external bypass valve
should be 15 psi (1.03 bar) higher than the normal
operating pressure of the piping system. An operating
pressure near the external bypass valve setting may
cause the liquid to recirculate unnecessarily.
10.Adjust the pressure setting of the B177 external
bypass valve if necessary. It can be adjusted by turning
the adjustment stem counterclockwise to increase
pressure and clockwise to decrease pressure.
11. Once a satisfactory pressure adjustment has
been achieved, attach the “tamper-proof” seal
furnished with the external bypass valve to prevent
unauthorized adjustments.
12.Open the shut-off valve located on the pump discharge
line downstream of the external bypass valve and
continue pumping as needed.
WARNING: Do not adjust the external bypass
valve beyond the range of the spring being used.
NOTE: On Anhydrous Ammonia and LP-Gas
installations, follow the guidelines provided
by Underwriter’s Laboratories, Inc. and NFPA
Pamphlet # 58.
Notice!
1. If the external automatic bypass valve is sized and set
correctly, a manual or hand operated bypass valve–
if applicable–should remain in the closed position
during normal operation. Keeping the manual or hand
operated bypass valve closed ensures the external
automatic bypass valve operates in a normal capacity.
2. Annual inspection and testing of the internal relief
valve–if applicable–and the external automatic bypass
valve are recommended. For testing procedures refer
to the adjustment procedures listed in this manual.
6

1
Registered trademark of the DuPont company.
Base Model B177-2 B177-2.5
Inlet 2" NPT 2-1/2" NPT
Outlet 2" NPT 2-1/2" NPT
Maximum ow rate (gpm) 300 350
Ship weight
lb (kg) 45 (20.4) 45 (20.4)
Springs
10–40 psig differential range No charge option A
30–80 psig differential range No charge option B
80–110 psig differential range No charge option C
100–125 psig differential range No charge option D
O-ring
Material
Buna-N Standard A
Neoprene®1 No charge option B
Viton®1 No charge option D
PTFE No charge option E
Flanges
2" NPT anges Standard N/A E
2" Slip-on weld anges Charge option N/A F
2.5" NPT anges N/A Standard J
2.5" Slip-on weld anges N/A Charge option K
Appendix A—B177 Model Number and Identication Code
Appendices
A. Model Number Identication Code and Available Options
7
Model Number
Base X X X

Appendix B—Specications
Inlet 2", 2-1/2"
Outlet 2", 2-1/2"
Differential pressure range psi (bar) 10–125 (0.69–8.60)
Maximum working pressure 400 psi (27.6 bar)
Can also be used as a differential back-pressure valve to assure adequate pressure on meters.
Part Standard Material Optional Material
Valve body Ductile iron: ASTM 536, 60-40-18
Valve bonnet Ductile iron: ASTM 536, 60-40-18
O-rings Buna-N Neoprene®1, Viton®1, PTFE
Spring Music wire/chrome silicon
Flanges Ductile iron: ASTM 536, 65-45-12 (NPT) Plate steel: ASTM A516 (weld ange)
Plunger ASTM A48 gray iron class 20
Plunger seat PTFE
Plunger bolt 3/8" – 16 x 3/4" button head capscrew
with hexagon socket—steel
Plunger nut Steel
Spring seat ASTM A48 gray iron class 30
Spring platform ASTM A108 GR 1200 steel
Stem seal Buna-N PTFE
Stem seal washer Steel
Retainer ring Steel
Seat retainer plate Steel
Low pressure build-up bypass valve 30 to 100 gpm
(9.1 to 79.5 m3/hr)
Used in bulk plant loading and unloading pumps.
1
Registered trademark of the DuPont company.
Material Specications
Operating Specications
Features & Benets
Equipment Type Applications
B. Specications
C. Performance
Appendix C—Model B177 Performance Curves
8

Appendix D—Outline Dimensions for Model B177
All dimensions are in inches (centimeters).
D. Outline Dimensions
Adjusting stem:
turn counterclockwise to
increase pressure setting
Inlet
Outlet
CORKEN
1/2" NPT
(connect to
vapor section
of storage tank)
5-1/4
(13.34)
4
(10.16)
5-3/4
(14.61)
4
(10.16)
2-7/8
( 7. 3 0)
16-37/64
(42.11)
9

Appendix E—Parts Details for Models B177-2 and B177-2.5
a
Registered trademark of the DuPont company.
b
_ denotes O-ring code. See chart above.
E. Parts Details
Ref.
No. Part No. Description Qty
12080 Lock 1
21698 Bonnet 1
37002-037NC125A Socket head - 3/8-16 X 1-1/4",
grade 8 4
41887 Stem seal 1
51789 Stem washer 1
65133-87 Retainer ring 1
71702 Adjusting stem 1
81701 Spring seat 1
9.
1783 Spring (10 to 40 psi) 1
1785 Spring (30 to 80 psi) 1
1786 Spring (80 to 110 psi) 1
10. 1786-1 Spring (100 to 125 psi) 1
11. 1780 Spring platform 1
12. 1872 Plunger bolt 1
13. 2732 Center headbolt gasket - steel 1
14. 1699 Plunger 1
Ref.
No. Part No. Description Qty
15. 1700 Seat - PTFE 1
16. 1703 Retainer plate 1
17. 1873 Locknut 1
18. 2-238_1 O-ring 1
19. 1699-X Plunger assembly 1
20. 7012-006SF019E Pan head Phillip 6-32 X3/16" 2
21. 1833 Nameplate 1
22. 3442 Pipe plug - 1/4 NPT 1
23. 1697 Body - B177-2 & B177-2.5 1
24. 2-234_ O-ring - Buna N 2
25. 7001-037NC150A Hex head - 3/8-16 X 1-1/2", gr L7 8
26.
1172-2 Flange - 2" NPT 2
1172-2S Flange - 2" Weld 2
1172-2. 5 Flange - 2.5" NPT 2
1172-2. 5S Flange - 2.5" Weld 2
1/2"NPT
Connection
4
2
1
3
5
6
20
21
22
26
12
13
14
15
16
17
18
23
24
24
25
26
25
7
8
9
11
10
19
O-ring Code
ABuna-N
BNeoprene®a
DViton®a
EPTFE
10

11

Printed in the U.S.A.
July 2020
CORKEN, INC. • A Unit of IDEX Corporation
9201 North I-35 Service Road, Oklahoma City, OK. 73131
Phone [phone] • Fax [phone]
Visit our website at http://www.corken.com
or e-mail us at [e-mail]
Solutions beyond products...
@CorkenInc