Check Valves(V33,VP33,VA33,VDA33,VH36,VL36,VCH36 Series)

Rev. 01-01
Aug. 2023

Check Valves

V33, VP33, VA33, VDA33, VH36 and VL36 Series
for VCH36 Series for CNG/NGV applications
Pressures up to 3,000 psig (206 bar) and 6,000 psig (413 bar)

Check Valves

Rev.01-01
Aug.2023

Features• Fixed cracking pressure valves : V33, VP33, VH36, VCH36 Series• Adjustable cracking pressure valves : VA33, VDA33 Series• Lift Check valves : VL36 Series

Technical Information
Valve Series

V33A, V33B,
V33C, V33D

Materials

SS316 & Brass

Maximum Working Pressure@70°F (21°C)
Unit : psig (bar)Temperature
Ratings°F (°C)

Cracking Pressure

V33 Series
V33E, V33F

SS316

3000
(206)

2000
(137)

Seal Material

Designator

FKM O-ring

Brass

VP33A, VP33B

VA33A, VA33B,
VDA33

VH36A,
VH36B

3000
(206)

3000
(206)

6000
(413)*

SS316 & Brass

1500
(103)

BN

(a)VH36 Series with FKM O-ring : -10 to 400 °F (-23 to 204 °C)• FKM is standard for SS316 valves.
• NBR is standard for Brass valves.

Seal Material

Designator-10 to 250(-23 to 121)

FFKM O-ring

KZ: 2, 3 page
: 3 page: 4, 5 page
: 4, 5 page

VH36 Series
VH36C

SS316

RatingRefer to spring table of each valve series• Poppet Check Valves, V33 Series• One-Piece Check Valves, VP33 Series• One-Piece Adjustable Check Valves, VA33 Series• In-Line Adjustable Check Valves, VDA33 Series

SS316 & Brass-10 to 375(-23 to 190)(a)VT

NBR O-ring

VA33 & VDA33
Series

VP33 Series

EPDM O-ring

SS316
5000
(344)*

Rating-50 to 300(-45 to 148)

EP

-10 to 600(-23 to 315)

• CNG/NGV Check Valves, VCH36 Series• High Pressure Check Valves, VH36 Series*• Lift Check Valves, VL36 Series: 6, 7 page
: 6, 7 page
: 8 page

Cracking, Reseal and Back Pressure @ 70°F(21°C)• Cracking Pressure : Valve poppet is actuated when the pressure difference between the inlet (upstream) and the outlet (downstream)
reaches the range of cracking pressure.
• Reseal Pressure : Valves that have higher cracking pressure can be resealed to bubble-tight by the spring force.
The reseal pressure is the pressure at the same flow direction, but lower than the cracking pressure.
• Back Pressure: Valves that have cracking pressure of 5 psig (0.34 bar) and lower may not be able to return to the bubble-tight seal.
This may require back pressure to press the seal to form a bubble-tight contact in addition to the spring force.

Class Ratings
Valve Series
Temperature, °F ( °C)-18 to 100 (-28 to 38)
200 (93)225 (175)

250 (121)

300 (148)350 (176)

375 (190)

400 (204)

V33 Series

V33A, V33B,
V33C, V33D
SS316

3000 (206)2575 (177)2510 (172)2450 (168)2325 (160)2255 (155)2185 (150)
-

Brass

3000 (206)2600 (179)2500 (172)2405 (165)-

V33E, V33F
SS316

VP33A, VP33B,
VA33A, VA33B, VDA33

Working Pressure, psig (bar)Brass2000 (137)1500 (103)1670 (115)1250 (86)1715 (118)

1630 (112)1545 (106)-1490 (102)

-

-

-

VP33, VA33, VDA33 Series

1450 (99)1300 (89)1200 (82)
-

-

-

-

* VH36 & VCH36 Series is Pressure ratings may be limited by the end connection. See Page 7, Dimensions Table.

1

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

SS316

3000 (206)2575 (177)2510 (172)2450 (168)2325 (160)2255 (155)2185 (150)
-

Brass

3000 (206)2600 (179)2500 (172)2405 (165)
-

-

-

-

www.dklok.com

VH36A,
VH36B

VH36 Series

SS316

6000 (413)5160 (355)5030 (346)4910 (338)4660 (321)4470 (308)4375 (301)4280 (294)

VH36C
SS316

5000 (344)4290 (295)4180 (288)4080 (281)3875 (267)3720 (256)3640 (250)3560 (245)V33 series

Material of Construction

Features• Working pressure up to 3,000 psig (206 bar)

Valve Body Materials

Stainless Steel

Component

Material Grade/ASTM

1. Body

2. Connector
3. Poppet
4. O-ring*
5. Spring

6. O-ring seal

SS316
/A276, A479

Brass 360
/B16

FKM

NBR

SS302/A313

FKM

7. Washer

Brass

Wetted parts are listed in blue.

4. O-ring* on V33E & V33F Series
is secured in poppet groove.

Lubrication :• Silicon-based Lubricant for
Poppet.

• Molybdenum Dry Film

Lubricant for SS316 Body
Threads.

NBR

SS316 With PTFE Coting

Operation• Valves that have not been actuated for a period of time may require a higher cracking pressure than the set cracking pressure.
• DK-Lok check valves prevent reverse flow in circuits. Do not use them as relief valves.
• DK-Lok check valves are designed to prevent loss of media caused by failed connections and for uni-directional flow control of fluids in chemical
processing, power generation, oil and gas industries.

Factory Test, Cleaning and Packaging• Every valve is factory tested for cracking and reseals performance.
• Every valve is cleaned, and packaged in accordance with DK-Lok cleaning standard of DC-01.
• Special cleaning and packaging in accordance with DK-Lok DC-11 in compliance with ASTM G93 Level C is available on request.

Ordering Information and Dimensions
Basic Ordering
Number

D-2T-

M-2NV33A-

V33DV33E-

V33F-

1/8 in. DK-Lok

D-6M-

6 mm DK-Lok

D-4T-

1/4 in. DK-Lok

1/4 in. Male NPT

D-10M-

10 mm DK-Lok

3/8 in. DK-Lok

3/8 in. Male NPT

F-6N-

3/8 in. Female NPT

D-12M-

12 mm DK-Lok

D-8T-

M-8NF-8N-

D-10T-

D-12T-

M-12N-

1/2 in. DK-Lok

1/2 in. Male NPT

1/2 in. Female NPT
5/8 in. DK-Lok

3/4 in. DK-Lok

3/4 in. Male NPT

F-12N-

3/4 in. Female NPT

M-16N-

1 in. Male NPT

D-16T-

F-16N-

4.8(0.19)

Cv
0.16

0.47

h-Hex

1 in. DK-Lok

1 in. Female NPT

www.dklok.com

Dimensions mm (in.)

H-Hex

15.88 (5/8)

55.60 (2.19)-

46.50 (1.83)

14.29 (9/16)
14.00

14.29 (9/16)-

7.1(0.28)

1.48

19.05 (3/4)

10.0(0.39)

1.7

22.22 (7/8)

13.5(0.53)

2.6

28.58 (1-1/8)

16.0(0.63)

5.2

31.75 (1-1/4)

18.0(0.71)

8.0

34.93 (1-3/8)

41.28 (1-5/8)

L

11.11 (7/16)-

1/4 in. Male NPT

1/4 in. Female NPT

M-6N-

Orifice
mm (in.)1/4 in. DK-Lok

F-4ND-6T-

Outlet1/8 in. Male NPT

1/8 in. Female NPT

M-4N-

V33C-

End Connections

F-2N-

MD-4N4T-

V33B-

Inlet

-

17.46 (11/16)
19.00
-

-

22.22 (7/8)
22.00
-

-

25.40 (1)28.58(1-1/8)-

44.40 (1.75)

60.00 (2.36)

56.40 (2.22)
53.40 (2.10)

56.80 (2.24)
65.50 (2.58)

55.50 (2.19)

63.80 (2.51)
80.20 (3.16)

74.40 (2.93)
84.70 (3.33)

91.80 (3.61)

110.70 (4.35)

105.30 (4.15)-

103.00 (4.06)-

115.8 (4.56)

38.1 (1-1/2)-

120.8 (4.75)
111 (4.37)

I

25.00 (0.98)-

25.00 (0.98)

27.10 (1.07)
36.20 (1.43)-

48.10 (1.89)
66.1 (2.6)-

68 (2.68)

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

2

Table 1. Spring Cracking, Reseal and Back Pressure @ 70 °F (21 °C) (for V33)
Spring Nominal
Cracking Pressure Designator
psig
1/3
1

3

bar

psig

0.07

0

0.02

0.21

10

0.69

50

3.45

25

75

100

Cracking Pressure Ranges

0

bar

psig

0

4

0

2

0.14

30

2.07

Minimum 17 (1.17) Reseal pressure

6.20

Minimum 53 (3.65) Reseal pressure

2.76

60

60

4.14

80

VP33 Series One-Piece Check Valves

Up to 4 (0.28) Back pressure

1.03

Minimum 3 (0.21) Reseal pressure

4.14

90

5.51

Up to 6 (0.41) Back pressure

Up to 6 (0.41) Back pressure

0.48

40

5.17

bar

0.21

7

15

1.38

Reseal Pressures
psig (bar)

0.28

0.48

20

Max. Pressure

3

7

1.72

6.89

Min. Pressure120

Minimum 35 (2.41) Reseal pressure

8.27

Minimum 70 (4.82) Reseal pressure

Features• O-ring seal blow-out proof design• One piece body construction.
• Working pressure up to 3,000 psig (206 bar)

Materials of Construction
Component

Stainless Steel

1. Body

2. Poppet

Valve Body Materials
Material Grade/ASTM

SS316/A276, A479

3. O-ring Holder

4. Locking Screw
5. O-ringFKM

6. Spring

Brass 360
/B16NBR

SS302/A313

Wetted parts are listed in blue.

Brass

Lubrication :• Silicon-based Lubricant on Poppet• Molybdenum Dry Film Lubricant on SS316 Locking Screw.

Ordering Information and Dimensions
Basic Ordering
Number

Inlet

M-4N-

F-4R-

1/4 in. ISO Female Tapered

1/4 in. Female NPT

1/4 in. Male NPT

FM-4N-

1/4 in. Female NPT

M-8NF-8N-

MF-8N-

1/2 in. Male NPT

psig
1/3
1

10
25

3

bar

psig

0.07

0

0.02

0.69
1.72

0

7

21

Min. Pressure

1/4 in. Male NPT

1.20

1/2 in. Female NPT

Cracking Pressure Ranges

Max. Pressure

61 (2.41)

64 (2.54)

44 (1.75)

58 (2.28)

1/2 in. Female NPTTable 2. Spring Cracking, Reseal and Back Pressure @ 70°F (21°C)
Spring Nominal
Cracking Pressure Designator

0.35

1/4 in. Female NPT

1/2 in. Male NPTL

Dimensions mm (in.)

41 (1.62)

1/4 in. ISO Male Tapered

MF-4N-VP33B-Cv

Outlet1/4 in. Male NPT

M-4RF-4N-

VP33A-End Connections

58 (2.28)

94 (3.71)

72 (2.83)

Hex.

14.28 (9/16)

19.05 (3/4)
22.22 (7/8)

26.98 (1-1/16)

Reseal Pressures
psig (bar)

bar

psig

0

4

0.28

5 to 20 (0.34 to 1.38) back pressure

29

2.00

Minimum 5 (0.34) Reseal pressure

0

0.48

1.45

3

13

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

bar

0.21

6 to 20 (0.41 to 1.38) back pressure

0.90

3 to 10 (0.21 to 0.69) back pressurewww.dklok.com

VA33 Series One-Piece Adjustable Check Valves / VDA33 Series In-Line Adjustable Check Valves

Features• Cracking pressure adjustable from 3 to 600 psig (0.2 to 41.3 bar)
• Working pressure up to 3,000 psig (206 bar)

• Temperature up to 190°C (375°F)with FKM O-ring• Standard materials : 316 stainless steel and brass.

VA33 Series

VDA33 Series

Materials of Construction
Component
VA33 Series
1. Body

1. Inlet body
2. Center body
3. Outlet body

Stainless SteelVDA33 Series

2. Poppet 360 / B16

4. Poppet

4. Insert

11. Insert

6. Locking screw

6. Locking screw

8. O-ring

8. O-ring

3. Insert locking screw
5. Adjustable screw
7. Spring

Wetted parts are listed in blue.

Valve Body Materials
Material Grade/ASTM

SS316/A276, A479

-

Brass

Brass
360 / B16

5. Adjustable screw
7. Spring

FKM, Optional FFKM

9. Inlet gasket
10. Outlet gasket

SS302/A313
TFE coated SS316

NBR

Lubrication :• Silicon-based Lubricant on Poppet• Molybdenum Dry Film Lubricant on SS316 Locking Screw and Insert Locking Screw.

www.dklok.com

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

4

VA33 Series Ordering Information and Dimensions
Basic
Ordering Number

VA33A-End Connections

F-4N

1/4 in. Female NPT

M-4R-

1/4 in. ISO Male Tappered

M-8R-

1/2 in. ISO Male Tappered

M-4N-

1/4 in. Male NPT

M-8N-

VA33B-

1/2 in. Male NPT

Cv
0.35
1.2

End Connections

VDA33

Inlet

D-4T-S

D-6M-S
D-8M-S

1/4 in. DK-Lok

Outlet6mm DK-Lok

MD-4N4T-S

8mm DK-Lok

1/4 in. Male NPT

1/4 in. DK-Lok

Table 3. Spring Cracking Pressure Range
Designator
Cracking Pressure Range@21 °C (70 °F)

psig

3 to 50

50 to 150

150 to 350
350 to 600

bar

0.2 to 3.4

3.4 to 10.3

10.3 to 24.1
24.1 to 41.3

Designator

Cv

0.37

Hex

in.

75.7

2.98

41.1

3/4

1.62

9/16

41.1

1.62

9/16

65.0

2.56

7/8

65.0

VDA33 Series Ordering Information and Dimensions
Basic Ordering
Number

L

mm

L

2.56

7/8

Dimensions mm(in.)
H

82.0(3.23)

9/16 in.

84.3(3.32)

16mm

82.0(3.23)
79.2(3.12)

14mm

9/16 in.

h

5/8 in.

Cracking Pressure vs Reseal pressure

VA33 and VDA33 Series valves set to crack at 20 psig(1.3 bar) or lower may require backpressure(downstream pressure) to reseal the valve bubble tight.

3

50

150
350

Example shown : For a valve set to crack at 31 bar (450 psig), the minimum reseal pressure
would be 27 bar (390psig).

How to adjust cracking pressure
Step 1Sllghtly unscrew the locking screw
counter-clockwise.

5

Step 2

Step 3

1. Gently slide the allen key up to adjustable screw position.
2. Adjust cracking pressure.
• To increase cracking pressure, turn adjustable screw clockwise.
• To decrease cracking pressure, turn adjustable screw counter-clockwise.

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

1. Move out the allen key up to the locking screw position.
2. To lock out the locking screw, turn the allen key clockwise.

www.dklok.com

VH36 Series High Pressure Check Valves / VCH36 Series CNG/NGV Check Valves

Features• High pressure 6,000 psig (413 bar)
• Seal blow-out proof design with the bonded seal on poppet.

Materials of Construction

Valve Body Material
Stainless Steel

Component

Material Grade/ASTM

1. Body

2. Connector

SS316 /A479, A276

3. Poppet stop

Wetted parts are listed in blue.

* Indicator ring bears the information of spring designator.

Poppet: SS316 /A479, A276
Bonded Seal : FKM, optional EPDM & Kalrez
HNBR standard for VCH36 Series

4. Poppet with bonded seal
5. Spring

Lubrication :• Silicon-based Lubricant on Poppet• Molybdenum Dry Film Lubricant on SS316 Connector
threads

SS302 /A313

6. Indicator ring*SS316 /A276

7. O-ring

FKM / HNBR standard for VCH36 Series

8. Backup ring

PTFE /D1710

9. 10. 11. DK-Lok Front & Back Ferruleand Nut

SS316 /A479, A276

CNG Certifications

VCH36 Series check with CNG compativle HNBR O-ring are available with CNG certifications.
Certificate No.

Certificates

ANSI / AGA NGV 3.1-1995
CGV NGV 12.3-M95

ECE R110

110R-000186

Classification

Class 0Temperature

Working Pressure

2010-REPORT-014 (00)2010-REPORT-013 (00)

-40 to 121 °C (-40 to 250 °F)-40 to 121 °C (-40 to 250 °F)

Check valve-40 to 120 °C (-40 to 250 °F)
274 bar @ 120 °C

273 bar @ 121 °C

Table 4. Spring Cracking, Reseal and Back Pressure @ 70°F (21°C)
Spring Nominal
Cracking Pressure Designator
psig

bar

psig

0.07

0

0

4

5

0.34

25

Max. Pressure

psig

0.02

10

Min. Pressure

bar

1/3
1

Cracking Pressure Ranges

0.69
1.72

0

0

3

0.21

20

1.38

7

0.48

bar

3

0.21

9

0.62

15

30

www.dklok.com

0.28

1.03

2.07

ISO 15500

Reseal Pressures
psig (bar)Up to 6 (0.41) back pressure

Up to 5 (0.35) back pressure

Up to 2 (0.14) back pressure

Minimum 3 (0.21) Reseal pressure

Mini mum 17 (1.2) Reseal pressure

Check valve

273 bar @ 121 °C

Sour Gas Service
Materials of VH36 series valves for sour gas service
are selected in accordance withthe requirements of NACE MR0175• Spring : alloy X-750/AMS5699• Nominal Cracking Pressure : 1/3, 1, and 5 psig
(0.03, 0.07 and 0.035 bar)
• Seal : ethylene propylene.
To order, insert-SG in the ordering number.
i.e., VH36B-D-8T-SG-S

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

6Ordering Information and Dimensions
Basic Ordering
NumberEnd Connections
D-2T-

1/4 in. DK-Lok

F-4N-

1/4 in. Female NPT

M-4N-

1/4 in. Male NPT

6 mm DK-Lok

M-2N-

D-8T-

1/2 in. DK-Lok

D-10M-

10 mm DK-Lok

F-6N-

3/8 in. Female NPT

D-8M-

D-12MF-8N-

1/2 in. Female NPT

M-8N-

1/2 in. Male NPT

M-6ND-12T-

1.8

22 mm DK-Lok

F-12N-

3/4 in. Female NPT

M-12N-

3/4 in. Male NPT

F-16N-

M-16N-

1

68.6 (2.70)

31.2 (1.23)

16

1

75.2 (2.96)

31.2 (1.23)

31.2 (1.23)

31.2 (1.23)
-

-

22

1

-

1

-

1-1/16-1

45.5 (1.79)

32

82.0 (3.23)

82.0 (3.23)

83.6 (3.29)

45.5 (1.79)

97.3 (3.83)

45.7 (1.80)

6000 (413)128.58 (1-1/8)

45.5 (1.79)

1

19

45.2 (1.78)

98.6 (3.88)

93.2 (3.67)

22.22 (7/8)-

31.2 (1.23)

45.5 (1.79)

97.3 (3.83)-

31.2 (1.23)

98.6 (3.88)

88.4 (3.48)

1 in. Male NPT6000 (413)

17.46 (11/16)

26.4 (1.04)

-

11/16

31.2 (1.23)

89.4 (3.52)

1 in. Female NPT-

69.9 (2.75)

69.3 (2.73)

4.7-

14.29 (9/16)

Pressure Rating
psig (bar)26.4 (1.04)

59.9 (2.36)

25 mm Dk-Lok

26.4 (1.04)

h45.5 (1.79)

77.0 (3.03)

1 in. DK-Lok

D-22M-

14

64.8 (2.55)

3/4 in. DK-Lok

D-25M-

VH36CVCH36C-

26.4 (1.04)

71.1 (2.80)

3/8 in. Male NPT

D-16T-

61.7 (2.43)

75.2 (2.96)

12 mm DK-Lok

H

11.11 (7/16)

55.1 (2.17)

8 mm DK-Lok

L1

26.4 (1.04)

54.1 (2.13)

3/8 in. DK-Lok

Dimensions mm (in.)

57.7 (2.27)

61.7 (2.43)

0.67

1/8 in. Male NPT

D-6T-

VH36BVCH36B-

L

1/8 in. DK-Lok

D-4T-

D-6M-

VH36AVCH36A-

Cv

5300 (365)4900 (337)16000 (413)5000 (344)38.1 (1-1/2)

4700 (323)404900 (337)4600 (316)

1-5/8

-

-

4600 (316)4400 (303)-5000 (344)-

How to Order

Select valve basic ordering number, applicable seal, spring nominal cracking pressure, and body material.
V33A-D-4T-

VP33B-F-8N-

BN-

VH36C-D-16T-

VT-

1/3-

EP-

Seal Material Designator

FKM : Nil for SS316 ValveNBR : Nil for Brass ValveHNBR : Nil for VCH36 CNG valves
FKM : VTNBR : BNEPDM : EP
FFKM : KZ

3-

Spring Nominal Cracking Pressure Designator

1/3 : 1/3 psig
1 : 1 psig
3 : 3 psig
10 : 10 psig
25 : 25 psig

B

S

Valve Body Material Designator

S : 316 stainless steel
B : Brass (exceptional VH36 Series)

Note :
Select the spring designator from Table 1, 2, 3
and 4 of each valve Series.

Spare Kits for Field Assembly

SpringO-ringHow to order VH36 Series spring kit.

How to order VH36 Series seal kit.

Prefix "9SPR" and select an applicable valve series and thedesignator of the spring nominal cracking pressure.
9SPR-(Valve series)-(spring designator)-2
Example : 9SPR-V33A-1/3-2

VH36 spring kit contains a spring and an indicator ring.
Select an applicable valve series and the designator of thespring nominal cracking pressure.
(Valve series)-RINGSPR-(spring designator)-SA
Example : VH36A-RINGSPR-5-SA
7

1-

S

Prefix "9ORG", select an applicable valve series and seal material
designator.
Example : 9ORG-V33A-BN

VH36 seal kit contains (Refer to VH36 Materials of Construction)#4. Poppet with bonded seal, #7. O-ring and #8. Backup ring.
Select an applicable valve series and seal material designatorSK-(valve series)-(seal material designator)
Examples : SK-VH36A-VT, SK-VH36B-BN.

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

www.dklok.com

VL36 Series Lift Check Valves

Features

Operation• Working pressure up to 6,000 psig (413 bar)
• Temperature up to 900 °F (482 °C)• Metal to metal seat

• Operation of this valve heavily depends on gravity assistance. Thus
mounting horizontally with bonnet nut upward to allow poppet tooperate vertically.
• Reverse flow closes the valve, keeping poppet in the or ce.
• Forward flow opens the valve, lifting the poppet• Lift check valve is primarily for use in liquid systems. If a slight amountof leakage can be tolerated it can be used with heavy gases.
• Reverse flow Cv is limited to less than 0.1% of forward Cv.

Materials of Construction
Component

Stainless SteelMaterial Grade/ASTM

1. Body

SS316/A276 or A479

2. Bonnet Nut

SS316/A276 or A479

3. Bonnet

TYPE630/A564

4. Poppet

SS316/A276 or A479

Complete Ordering Number and Dimensions
Complete
Ordering Number

VL36A-VL36B-

1/4 in. DK-Lok

F2N-S

1/8 in. Female NPT

F4N-S

mm

6 mm DK-Lok

4.0

1/4 in. Female NPT

SW4T-S

1/4 in. Tube Socket Weld

F4N-S

1/4 in. Female NPT

D6T-S

SW6T-S

SW8T-S
D8T-S

VL36C-

End
Connection

D4T-S

D6M-S

Orifice

D12T-S
F6N-S

F8N-S

SW8T-S

3/8 in. DK-Lok

3/8 in. Tube Socket Weld

1/2 in. Tube Socket Weld

6.4

inch

0.156

0.250

Cv

L

0.30

0.64

1/2 in. DK-Lok

3/4 in. DK-Lok

3/8 in. Female NPT

1/2 in. Female NPT

11.1

0.437

1/2 in. Tube Socket Weld

2.20

Valve Body Material

61.0 (2.40)

50.8 (2.00)

46.0 (1.81)
71.9(2.83)

57.2 (2.25)
99.6 (3.92)
79.2(3.12)

Dimensions mm (in.)
H

37.3(1.47)

47.0(1.85)

H1

9.9
(.39)

12.7
(.50)

Pressure-Temperature Ratings
Hex

7/8

ASME Class

Material Group
Material Name
Temp.
°F(°C)-65 to 100(-53 to 37)

1 1/4

15.7
(.62)

1 1/2

79.5 (3.13)

How to order : Select a complete ordering number. i.e., VL36A-D-4T-S.

2.2

SS316

Working
Pressure
psig (bar)6000 (413)

200 (93)

5160 (355)

400 (204)

4280 (294)300 (148)500 (260)62.0(2.44)

2500

600 (315)
700 (371)
800 (426)
900 (482)

4660 (321)3980 (274)3760 (259)3600 (248)3460 (238)3280 (225)

All dimensions shown are for reference only and subject to change. Dimensions with DK-LOK are in finger-tight position.
We reserve the right to change specification stated in this catalog for our continuing program of product improvement.

Safe Valve Selection

The selection of a valve for any application or system design must be considered to ensure safe performance. Valve function, valve
rating, material compatibility, proper installation, operation and maintenance remain the sole responsibility of the system designer
and the user. DK-Lok accepts no liability for any improper selection, installation, operation or maintenance.

www.dklok.com

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

8

VC34 CNG Check Valves

Rev. 01-01
Aug. 2023

CNG Check Valves

Check Valves

Rev.01-01
Aug.2023

Features• High Flow check valve.
• Bar stock two piece study design.
• Poppet O-ring secured on groove provides leak-tight seal.
• Unidirectional flow control of fluids• Prevent loss of media caused by failed connections.

Materials of Construction
No.
1

2

3

5

7

Flow Rate: 2090 SCFM (3551 Nm /hr)
Working Pressure: 3600 psi (248 bar)
Burst Pressure: 25,000 psi (1724 bar)Temperature Range: - 40 to 120 °C (-40 to 250 °F)

Q'ty

Connector

SS 316

1

Poppet Cap

SS 316O-ring

HNBR

Body

Spring1" Female NPT

VC34-F16R-S

1" Female ISO 7-1

1

1

d

L

F

2.48
(63)

1
(25.4)

6.04(153.5)

2.24(57)

Factory Test, Cleaning and Packaging

All dimensions are in millimeters unless otherwise specified and only for reference subject to change.

1D

Every valve is factory tested for cracking and reseal performance and cleaned, packaged in accordance with DK-LOK cleaning
standard of DC-01.

1

1

Dimension in.(mm)Outlet

VC34-F16N-S

1

SS 304

End Connections

Inlet

1

HNBR

Ordering Number and Dimensions
Ordering Number

SS 316SS 316O-ring

6

3

Material

Poppet4

Technical Data

Component

www.dklok.com