TOM WHEATLEY Piston Check Valves Brochure
User Manual: TOM WHEATLEY Piston Check Valves Brochure Resource Library
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TOM WHEATLEY Piston Check Valves
Designed to safely prevent backflow, preventing damage to pumps and compressors
TOM WHEATLEY PISTON CHECK VALVES
Features ................................................................................................ 1
How to Order ....................................................................................... 2
Dimensions ........................................................................................... 3
Materials of Construction ...................................................................... 4
Pressure-loss Curves / Flow Coefficients ................................................. 5
Table of Contents
1
TOM WHEATLEY Piston Check Valves
FEATURES
When pressure surges and pulsations are prevalent in a flow
system, Cameron’s TOM WHEATLEY® piston check valves are
an efficient solution to system protection.
Due to a unique non-slam design, TOM WHEATLEY piston
check valves have provided years of uninterrupted service
downstream from reciprocating pumps and compressors,
and in other applications where conventional check valve
designs would be subjected to excessive wear. In addition,
the TOM WHEATLEY piston check valve top entry design
allows for easy access and replacement of all valve internal
parts with reduced downtime.
Smooth, Reliable Prevention of Backflow
In the absence of pressure differential, a TOM WHEATLEY
piston check valve rests in the closed position due to gravity
and spring force. Pressure on the upstream end of the valve
lifts the piston off the seat and allows flow. As flow varies,
the piston of the TOM WHEATLEY piston check valve floats
within a cylinder. Should the flow cease, the piston lowers
and seats to create a bubble-tight prevention of backflow.
Spring provides
positive closure
Orifice controls closing speed
of piston, dampening piston
response to changes in flow
Easy access to all valve
internal parts through cover
Ball check valve inside piston
allows quick opening
Integral or removable seat
designs available;
metal overlays also are
available
Liner
Piston
The greater the backflow
pressure, the tighter the seal
Available in RF or RTJ end connections.
A ball check mechanism and an adjacent orifice within the
piston help to extend valve life by dampening piston
movement and eliminating slamming or chattering in the
event of sudden pressure surges or erratic flow conditions.
The orifice size affects the degree of piston movement and is
optimally selected at the factory to meet the requirements of
a specified flow range.
The TOM WHEATLEY piston check valve is available with the
following features:
• Soft seal
• Metal-to-metal seal
• Renewable seat
• A variety of body and trim materials
As a result of the piston and seat design, the greater the
backpressure acting on the piston, the tighter the seal.
TOM WHEATLEY piston check valves comply with API 6D/
ISO 14313, ASTM B 16.34 and NACE MR0175/ISO 15156,
and all TOM WHEATLEY piston check valves are designed for
horizontal service. TOM WHEATLEY piston check valves must
be ordered specifically for vertical flow when intended for
that service.
2
HOW TO ORDER
Valve Size ASME End Connection/ Trim
(in.) Pressure Class Seat Code
Ordering Data 02 06 75 10B
02 = 2”
03 = 3”
04 = 4”
06 = 6”
08 = 8”
10 = 10”
12 = 12”
01 = ASME 150
03 = ASME 300
06 = ASME 600
09 = ASME 900
15 = ASME 1500
73 = RF – Renewable Seat
74 = RTJ – Renewable Seat
75 = RF – Integral Seat
76 = RTJ – Integral Seat
Materials Code
Represents 2” ASME 600 RF with Integral Seat 10B
Body ASTM A216 Gr. WCC
Cover A516 Gr. 70
Cover Seal Buna-N
Bolting ASTM A193 Gr. B7, ASTM A194 Gr. 2H
Liner ASTM A29-1018 with ENP
Piston 410 Stainless Steel
Piston Seal Buna-N
Seat Integral
Piston Rings Cast Iron
Materials Code – See standard materials of constructions.
Note: The alpha character represents the seal material code.
Note: Other materials of construction and seals are available upon request.
3
DIMENSIONS
Nominal Size
in. (mm)
ASME
Class A (RF) A (RTJ) B C D E
2 (50)
150 10.50 (267)* 11.13 (283)* 5.25 (134) 9.25 (235) 7.00 (178) 6.00 (152)
300 10.50 (267) 11.13 (283) 5.25 (134) 9.25 (235) 7.00 (178) 6.50 (165)
600 11.50 (292) 11.63 (295) 5.75 (146) 9.50 (241) 7.00 (178) 6.50 (165)
900 14.50 (368) 14.63 (372) 7.25 (184) 10.00 (254) 7.63 (194) 8.50 (216)
1500 14.50 (368) 14.63 (372) 7.25 (184) 10.25 (260) 7.63 (194) 8.50 (216)
3 (80)
150 12.50 (318)* 13.13 (334)* 6.25 (159) 10.75 (273) 8.25 (210) 7.50 (191)
300 12.50 (318) 13.13 (334) 6.25 (159) 10.75 (273) 8.25 (210) 8.25 (210)
600 14.00 (356) 14.13 (359) 7.00 (178) 11.13 (283) 8.25 (210) 8.25 (210)
900 15.00 (381) 15.13 (384) 7.50 (191) 11.38 (289) 8.25 (210) 9.50 (241)
1500 18.50 (470) 18.63 (473) 9.25 (235) 13.13 (334) 11.63 (295) 10.50 (267)
4 (100)
150 14.00 (356)* 14.63 (372)* 7.00 (178) 11.50 (292) 9.75 (248) 9.00 (229)
300 14.00 (356) 14.63 (372) 7.00 (178) 11.50 (292) 9.75 (248) 10.00 (254)
600 17.00 (432) 17.13 (435) 8.50 (216) 11.88 (302) 9.75 (248) 10.75 (273)
900 18.00 (457) 18.13 (461) 9.00 (229) 12.37 (314) 9.75 (248) 11.50 (292)
1500 21.50 (546) 21.63 (549) 10.75 (273) 13.00 (330) 10.75 (273) 12.25 (311)
6 (150)
150 17.50 (445)* 18.13 (461)* 8.75 (223) 16.38 (416) 11.75 (298) 11.00 (279)
300 17.50 (445) 18.13 (461) 8.75 (223) 16.38 (416) 11.75 (298) 12.50 (318)
600 22.00 (559) 22.13 (562) 11.00 (280) 17.07 (434) 12.25 (311) 14.00 (356)
900 24.00 (610) 24.13 (613) 12.00 (305) 17.25 (438) 11.75 (298) 15.00 (381)
1500 27.75 (705) 28.00 (711) 13.88 (353) 15.75 (400) 13.13 (334) 15.50(394)
8 (200)
150 19.50 (495) 20.00 (508) 9.75 (248) 13.00 (330) 14.75 (375) 13,.50 (343)
300 21.00 (533) 21.63 (549) 10.50 (267) 13.88 (352) 14.75 (375) 17.50 (445)
600 26.00 (660) 26.13 (664) 13.00 (330) 14.88 (378) 14.75 (375) 16.50 (419)
900 29.00 (737) 29.13 (740) 14.50 (368) 15.13 (384) 14.69 (373) 18.50 (470)
10 (250)
150 24.50 (622) 25.00 (635) 12.25 (311) 15.38 (391) 17.50 (445) 16.00 (406)
300 24.50 (622) 25.13 (638) 12.25 (311) 15.38 (391) 17.50 (445) 17.50 (445)
600 31.00 (787) 31.13 (791) 15.50 (394) 16.38 (416) 17.50 (445) 20.00 (508)
900 33.00 (838) 33.13 (842) 16.50 (419) 16.88 (429) 17.50 (445) 21.50 (546)
12 (300)
150 27.50 (699) 28.00 (711) 13.75 (349) 18.50 (470) 21.00 (533) 19.00 (483)
300 28.00 (711) 28.63 (727) 14.00 (356) 18.50 (470) 21.00 (533) 20.50 (521)
600 33.00 (838) 33.13 (842) 16.50 (419) 18.26 (464) 21.00 (533) 22.00 (559)
900 38.00 (965) 38.13 (969) 19.00 (483) 19.13 (486) 21.00 (533) 24.00 (610)
* Length exceeds dimensions given in API 6D/ISO 14313.
Removable Seat Detail
Size
2” - 6”
8” - 12”
E
B
C
D
A
C
ASME Class 150-1500, 2” through 12”
Components
US Standard
Trim 10
“X” “X”
Canada
Standard
Trim 12 “X” “X”
Stainless Steel
Trim 20
“X” “X”
Full Stainless
Trim 30
“X” “X”
Metal-to-Metal
Trim 40
“X” “X”
Stellite™ Facing
Seat/Piston
Trim 50 “X” “X”
Body A216-WCC A352-LCC A216-WCC A351-CF8M A216-WCC A216-WCC
Cover ASTM A515 Gr. 70 ASTM A516 Gr. 70 ASTM A515 Gr. 70 A240-316 ASTM A515 Gr. 70 ASTM A515 Gr. 70
Cover Seal See Note 1 See Note 1 See Note 1 See Note 1 See Note 1 See Note 1
Bolting A193 Gr. B7
A194 Gr. 2H
A320 Gr. L7M
A194 Gr. 7M
A193 Gr. B7
A194 Gr. 2H
A193 Gr. B7M
A194 Gr. 8M
A193 Gr. B7
A194 Gr. 2H
A193 Gr. B7
A194 Gr. 2H
Liner A29-1018 ENP A29-1018 ENP A29-1018 ENP A29-1018 ENP A29-1018 ENP A29-1018 ENP
Piston 410 SS 410 SS 410 SS 410 SS 410 SS 410 SS w/Stellite #6
Hard Face
Piston Seal See Note 1 See Note 1 See Note 1 See Note 1 n/a See Note 1
Seat Integral A216-WCC A352-LCC n/a A351-CF8M n/a n/a
Seat Renewable Carbon Steel Carbon Steel 316 SS 316 SS Carbon Steel 410 SS w/Stellite #6
Hard Face
Piston Rings Cast Iron Cast Iron Cast Iron Cast Iron ENP Cast Iron Cast Iron
Piston Spring Alloy X-750 Alloy X-750 Alloy X-750 Alloy X-750 Alloy X-750 Alloy X-750
4
MATERIALS OF CONSTRUCTION
Notes:
1. In the trim number description, “X” “X” relates to the cover and piston seal material options.
When ordering, replace the first “X” with the cover seal from the list below. Use the second “X” only when the piston seal is
different from the cover seal (i.e., VM for FKM (Viton®) cover seal and metal-to-metal piston seal).
B = Buna-N
V = FKM (Viton)
T = Teflon®
M = Metal-to-metal*
H = HSN
F = Fiber gasket
A = AFLAS
* Not available in fig. 75 or 76
Other seal material options are available upon request.
2. N/A = Not available
3. ENP = Electroless nickel plated
4. EHC = Engineered hard chrome plating
5. Materials comply with NACE MR0175/ISO 15156
6. Other materials are available upon request
5
PRESSURE-LOSS CURVES/FLOW COEFFICIENTS
Pressure-loss Curves
Valve Size CV
2 46
3 104
4 212
6 477
8 848
10 1325
12 1908
FLOW RATE (gal/min. of water)
Dotted lines represent pressure loss for valves without springs.
DIFFERENTIAL PRESSURE (psi)
The equations listed below are the basis for the above nomogram. The nomogram is a
method for solving the equations below quickly and simply when service fluid is water.
Flow Coefficients (CV)
Full Open Valves
Liquid (incompressible flow)
Where:
Q = FLOW: LIQUIDS – gal/min
GASES – cf/hour
CV = FLOW COEFFICIENT
P1 = INLET PRESSURE (psia)
P2 = OUTLET PRESSURE (psia)
rP = PRESSURE DROP (P1 – P2)
T = ABSOLUTE TEMPERATURE (° F + 460)
G = SPECIFIC GRAVITY (WATER = 1)
CV = Q G
rPQ = CV
rP
G
rP =[]
Q
CV
2
G
Gas (compressible flow)
CV = GT
P1
2 - P2
2
Q
963
Q = P1
2 - P2
2
GT
CV 963
Flow Coefficients
3250 Briarpark Drive, Suite 300
Houston, TX 77042
USA
Toll Free 1.800.323.9160
Learn more about TOM WHEATLEY piston check valves at:
www.c-a-m.com/TOMWHEATLEY
TOMWHEATLEY@c-a-m.com
©2014 Cameron | TOM WHEATLEY is a registered trademark of Cameron. Stellite is a trademark of Deloro Stellite Company, Inc. Teflon and Viton are registered trademarks of E.I.
DuPont De Nemours & Company | SWP 1.5M 3/14 AD00298V
HSE Policy Statement
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working environment where no one gets hurt and nothing gets harmed.
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