Page 1
DOUBLE DOOR
CHECK VALVES
- 186 -
● ASME Class 300 rated check valves
● Wafer body style fits between FF or RF flanges
● Size 6” and larger are supplied with a valve lifting lug
● Upper and lower SS thrust washers
● Resilient Buna-N and Viton
● Seat design lifts then swings discs to minimize seat
wear
● Shock bumpers minimize stresses in hinge pins
● Independent springs optimizes valve plate closing
rates while minimizing spring stress
● Dual ratings 2"-3" 150#, 300# and 600#.
● Dual ratings 4" 150# and 300#.
M
ODELS
● 300WTCT – Cast Steel Body, Stainless Steel Disc, Buna Seat
● 300WTTT – Stainless Steel Body, Stainless Steel Disc, Viton Seat
OPTIONS
(CONSULT FACTORY
)
● EPDM Seats
● Other Spring Material
APPLICABLE CODES
●ASME B16.34 ratings
● API 594
● API 598
Canadian Registration - OC10274.5C
300WT SERIES
CAST STEEL AND STAINLESS STEEL
DOUBLE DOOR CHECK VALVES
P
RESSURES TO 740 PSIG (51 BARG)
T
EMPERATURES TO 600ºF (316ºC)
APPLICA TIONS
● Liquid and Air Service
● Process Industry
● Power Industry
● Chemical Industry
● Oil & Gas
● Pulp & Paper
● Metal & Mining
● Water & Waste
0600- 300WTCTB-T
123456789101112131415
Inlet Size Model Seat Dash Spring
300WT Series Ordering Code
Inlet Size* - Position 1 - 4
0400 - 4"
0600 - 6"
0800 - 8"
1000 - 10"
1200 - 12"
Dash - Position 5
Model - Position 6 - 12
300WTCT - CS Body
300WTTT - SS Body
Seat* - Position 13
B - Buna-N (CS Body only)
V - Viton (SS Body only)
Dash - Position 14
Spring - Position 15
T - SS
*300WTCT - Buna-N seat only
300WTTT - Viton seat only
PRESSURE/TEMPERATURE CHART
ASME B16.34
2", 2
1
⁄2
", 3" sizes use 600WT Series
Contact factory for EPDM pressure/temperature range.
Viton Seats
Buna Seats
EPDM Seats
Metal Seats
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DOUBLE DOOR
CHECK VALVES
- 187 -
Connections: 4" to 12"
Wafer Flanged
300WT SERIES
CAST STEEL AND STAINLESS STEEL
DOUBLE DOOR CHECK VALVES
SPECIFICATION
Check Valve shall be dual disc design with Cast Steel or Stainless Steel Body
wafer body style designed to ASME B16.34 ratings and API 594. The check valve
shall have an integral cast bumper and Buna-N or Viton resilent seats with SS
discs. The check valve shall be ASME Class 300 rated. The spring shall be 316SS.
The seat design shall lift then swing discs to minimize seat wear. The check valve
shall be SSI 300WT Series..
M
ATERIALS OF CONSTRUCTION
Part Carbon Steel Stainless Steel
Body A216-WCB A351-CF8M
Discs A351-CF8M A351-CF8M
Seat Buna-N Viton
Spring 304 SS 304 SS
CRACKING PRESSURE
Horizontal Mounting - .3psid
Vertical Mounting - .75 to 1.25 psid
Seats:
CS Body - 4" to 12" Buna-N
SS Body – 4" to 12" Viton
Size A
1
B* C
2
DE
STUD SELECTION
Weight
Qty. Dia. Length
2
3
(50)
2
1
⁄2
3
(66)
3
3
(80)
150WT
27⁄
8 6
7
⁄
8 3
3
⁄
8 4
1
⁄
2 3/4 8 5/8 7 18
4
4
(73) (175) (86) (114) (19) (16) (178) (8.2)
(100)
300WT
27⁄
8 7
1
⁄
8 3
3
⁄
8 4
1
⁄
2 3/4 8 3/4 8
1
⁄
8 18
(73) (181) (86) (114) (19) (19) (207) (8.2)
63
7
⁄8 97⁄8 53⁄8 65⁄8 13⁄8 12 3/4 95⁄8 44
(150) (99) (251) (137) (168) (35) (19) (245) (20.0)
8512
1
⁄8 73⁄8 85⁄8 2 12 7/8 111⁄4 75
(200) (127) (308) (187) (219) (51) (22) (286) (34.0)
10 53⁄4 141⁄4 91⁄2 103⁄4 27⁄8 16 1 123⁄4 123
(250) (146) (362) (241) (273) (73) (25) (324) (55.8)
12 71⁄8 165⁄8 111⁄4 123⁄4 33⁄8 16 11⁄8 145⁄8 196
(300) (181) (422) (286) (324) (86) (29) (372) (89.0)
1. Dimensions in accordance with API 594.
2. Minimum bore diameter of companion flanges.
3. Sizes 2", 21⁄2" & 3" for 150WT, 300WT & 600WT are interchangeable, use 600WT for all
applications in these sizes.
4. Size 4" for 150WT &300WT are interchangeable, use 300WT for 4" size. 4" sizes fit between both
150# & 300# flanges.
* Add the “B” dimension and the diameter of the stud to achieve the ANSI B16.5 bolt hole circle
diameter.
DIMENSIONS inches (mm) AND WEIGHTS pounds (kg)
Use 3" 600WT 300# on page 191
Use 2" 600WT 300# on page 191
Use 21⁄
2
" 600WT 300# on page 191
B
DC
A
E
Page 3
DOUBLE DOOR
CHECK VALVES
- 188 -
300WT SERIES DOUBLE DOOR CHECK VALVES
C
AST STEEL AND STAINLESS STEEL
Valve Size
(inches)
4 5 6 8 10 12
C
v
291 494 705 17952563 4295
10
100 1000 10000 100000
FLOW RATE (GPM)
PRESSURE DROP (PSID)
4
5
6
10
1
0.1
HORIZONTAL MOUNTED
VALVE CRACKING PRESSURE
8
10
12
(1) Pressure drop curves are based on water flow.
(2) Valve cracking pressure is equal to or less than 0.3 psid when mounted horizontally.
(3) Valve cracking pressure increases to between 0.75 and 1.25 psid when installed
vertically with flow upwards.
CVV
ALUES
(US-GPM @ 1 PSID)
PRESSURE DROP - AIR
Sizes 4" - 12"
100
1000 10000 100000 1000000
FLOW RATE (GPM)
PRESSURE DROP (PSID)
6
5
4
10
1
0.1
HORIZONTAL MOUNTED
VALVE CRACKING PRESSURE
8
10
12
(1) Pressure drop curves are based on air flow at 60 0F and 1 ATM pressure.
(2) Valve cracking pressure is equal to or less than 0.3 psidwhen mounted horizontally.
(3) Valve cracking pressure increases to between 0.75 and
1.25 psid when installed vertically with flow upwards.
Installation Note:
1) For correct installation and maintenance please see our I&M manual.
2) Horizontal installation – Disc pin
must be installed in vertical position.
3) Vertical installation (downward flow)
– Consult factory.
PRESSURE DROP - LIQUIDS
Sizes 4" - 12"
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