V33, VP33, VA33, VDA33, VH36 and VL36 Series VCH36 Series for CNG/NGV applications Pressures up to 3000 psig (206 bar) and 6000 psig (413 bar)

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1 V, VP, VA, VDA, VH6 and VL6 Series VCH6 Series for CNG/NGV applications Pressures up to g (26 ) and 6 g (4 ) Catalog No. V6 December 2 Features Fixed cracking pressure valves: V, VP, VH6, VCH6 Series Adjustable cracking pressure valves: VA, VDA Series Lift Check valves: VL6 Series Technical Information Valve Series VA, VB, VC, VD V Series VE, VF VP Series VPA, VPB VA & VDA Series VAA, VAB, VDA VH6A, VH6B VH6 Series VH6C Materials SS6 & SS6 SS6 & SS6 & SS6 SS6 Working F (2 C) Unit: () Temperature Ratings F ( C) Cracking Pressure (26) 2 () 5 () (26) Seal Material Designator Rating Seal Material Designator Rating FKM Oring VT to 5 5 to EPDM Oring EP (2 to 9) (a) (45 to 48) NBR Oring BN to to 4 (2 to 2) FFKM Oring KZ ( to 2) (a)vh6 Series with FKM Oring: to 4 F (2 to 24 C) FKM is standard for SS6 valves. NBR is standard for valves. Refer to spring table of each valve series (26) 6 (4) 5 (44) Poppet Check Valves, V Series : 2 page High Pressure Check Valves, VH6 Series : 6, page OnePiece Check Valves, VP Series : page CNG/NGV Check Valves, VCH6 Series : 6, page OnePiece Adjustable Check Valves, VA Series : 4, 5 page Lift Check Valves, VL6 Series : 8 page InLine Adjustable Check Valves, VDA Series : 4, 5 page Cracking, Reseal and Back (2 ) 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: Back Pressure: Valves that have higher cracking pressure can be resealed to bubbletight by the spring force. The reseal pressure is the pressure at the same flow direction, but lower than the cracking pressure. Valves that have cracking pressure of 5 g (.4 ) and lower may not be able to return to the bubbletight seal. This may require back pressure to press the seal to form a bubbletight contact in addition to the spring force. Class Ratings Valve Series VA, VB, VC, VD V Series VP, VA, VDA Series VH6 Series VE, VF VPA, VPB, VAA, VAB, VDA VH6A, VH6B VH6C Temperature, F ( C) SS6 SS6 Working Pressure, g ( ) SS6 SS6 8 to (28 to 8) ( 26) ( 26) 2 ( ) 5 ( ) ( 26) ( 26) 6 ( 4) 5 ( 44) 2 (9) 255 ( ) 26 ( 9) 5 ( 8) ( 89) 255 ( ) 26 ( 9) 56 ( 55) 429 ( 295) 225 (5) 25 ( 2) 25 ( 2) 6 ( 5) 25 ( 86) 25 ( 2) 25 ( 2) 5 ( 46) 48 ( 288) 25 (2) 245 ( 68) 245 ( 65) 6 ( 2) 2 ( 82) 245 ( 68) 245 ( 65) 49 ( 8) 48 ( 28) (48) 225 ( 6) 545 ( 6) 225 ( 6) 466 ( 2) 85 ( 26) 5 (6) 2255 ( 55) 49 ( 2) 2255 ( 55) 44 ( 8) 2 ( 256) 5 (9) 285 ( 5) 45 ( 99) 285 ( 5) 45 ( ) 64 ( 25) 4 (24) 428 ( 294) 56 ( 245)

2 Operation Valves that have not been actuated for a period of time may require a higher cracking pressure than the set cracking pressure. DKLOK check valves prevent reverse flow in circuits. Do not use them as relief valves. DKLOK check valves are designed to prevent loss of media caused by failed connections and for unidirectional 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 DKLOK cleaning standard of DC. Special cleaning and packaging in accordance with DKLOK DC in compliance with ASTM G9 Level C is available on request. V Series Poppet Check Valves Feature: Working pressure up to g (26 ) Material of Construction. Body 2. Connector. Poppet 4. Oring* 5. Spring 6. Oring seal V series Working pressure up to g (26 ) SS6 /A26, A49 FKM Valve Body Materials SS2/A 6 /B6 NBR FKM NBR Wetted parts are listed in blue. 4. Oring* on VE & VF Series is secured in poppet groove. Lubrication : Siliconbased Lubricant for Poppet. Molybdenum Dry Film Lubricant for SS6 Body Threads. Model Shown: V Series Check Valves VCD8TS VCF6NEP/S V Series Ordering Information and Dimensions Basic Ordering Orifice Dimensions mm ( inch) Number Inlet Outlet mm ( in. ) hhex HHex L l VA VB VC VD VE VF D2T M2N F2N D4T D6M MD4N4T M4N F4N D6T DM M6N F6N D8T D2M M8N F8N DT D2T M2N F2N D6T M6N F6N /8 in. DkLok /8 in. Male NPT /8 in. Female NPT /4 in. DkLok 6 mm DkLok /4 in. Male NPT /4 in. DkLok /4 in. Male NPT /4 in. Female NPT /8 in. DkLok mm DkLok /8 in. Male NPT /8 in. Female NPT /2 in. DkLok 2 mm DkLok /2 in. Male NPT /2 in. Female NPT 5/8 in. DkLok /4 in. DkLok /4 in. Male NPT /4 in. Female NPT in. DkLok in. Male NPT in. Female NPT 4.8 (.9). (.28). (.9).5 (.5) 6. (.6) 8. (.) Table. Spring Cracking, Reseal and Back (2 ) ( 5/8) 9.5 ( /4) ( /8) ( /8).5 ( /4) 4.9 ( /8) 4.28 ( 5/8). ( /6) 4.29 ( 9/6) ( 9/6).46 ( /6) ( /8) ( ) 28.58( /8) 8. ( /2) 55.6 ( 2.9) 44.4 (.5) 46.5 (.8) 6. ( 2.6) 56.4 ( 2.22) 5.4 ( 2.) 56.8 ( 2.24) 65.5 ( 2.58) 55.5 ( 2.9) 6.8 ( 2.5) 8.2 (.6) 4.4 ( 2.9) 84. (.) 9.8 (.6). ( 4.5) 5. ( 4.5). ( 4.6) 2. ( 4.) 6.2 ( 4.5).4 ( 4.9) 25. (.98) 25. (.98) 2. (.) 6.2 (.4) 48. (.89) 6. ( 2.64) Spring Nominal Cracking Pressure Ranges Cracking Pressure Designator Min. Pressure Max. Pressure Reseal Pressures () /.2.2 Up to 6 (.4) Back pressure Up to 6 (.4) Back pressure Up to 4 (.28) Back pressure Minimum (.2) Reseal pressure Minimum (.) Reseal pressure Minimum 5 (2.4) Reseal pressure Minimum 5 (.65) Reseal pressure Minimum (4.82) Reseal pressure 68.4 ( 2.69) 2 22, DK Tech Corporation, All right reserved.

3 VP Series OnePiece Check Valves Features: Oring seal blowout proof design One piece body construction. Working pressure up to g (26 ) Materials of Construction. Body 2. Poppet. Oring Holder 4. Locking Screw 5. Oring 6. Spring SS6 /A26, A49 Wetted parts are listed in blue. Lubrication: Siliconbased Lubricant on Poppet Molybdenum Dry Film Lubricant on SS6 Locking Screw. FKM Valve Body Materials SS2/A 6 /B6 NBR VP Series Ordering Information and Dimensions Basic Ordering Number VPA VPB M4N M4R F4N F4R MF4N FM4N M8N F8N MF8N Inlet Outlet /4 in. Male NPT /4 in. ISO Male Tapered /4 in. Female NPT /4 in. ISO Female Tapered /4 in. Male NPT /4 in. Female NPT /4 in. Female NPT /4 in. Male NPT /2 in. Male NPT /2 in. Female NPT /2 in. Male NPT /2 in. Male NPT.5.2 Dimensions mm ( inch) L Hex. 4 (.62) 6 ( 2.4) 64 ( 2.54) 44 (.5) 58 ( 2.28) 58 ( 2.28) 94 (.) 2 ( 2.8) 4.28 ( 9/6) 9.5 ( /4) ( /8) ( /6) Table 2. Spring Cracking, Reseal and Back (2 ) Spring Nominal Cracking Pressure Ranges Cracking Pressure Designator Min. Pressure Max. Pressure g g Reseal Pressures () / to 2 (.4 to.8) back pressure to 2 (.4 to.8) back pressure to (.2 to.69) back pressure Minimum 5 (.4) Reseal pressure

4 VA Series OnePiece Adjustable Check Valves VDA Series InLine Adjustable Check Valves VA & VDA Series Features Cracking pressure adjustable from to 6 g (.2 to 4. ) Working pressure up to g (26 ) Temperature up to 9 (5 )with FKM Oring Standard materials : 6 stainless steel and brass. VA Series Check Valves VDA Series Materials of Construction Wetted parts are listed in blue. Lubrication: Siliconbased Lubricant on Poppet Molybdenum Dry Film Lubricant on SS6 Locking Screw and Insert Locking Screw. Valve Body Materials VA Series VDA Series. Inlet body. Body 2. Center body. Outlet body SS6 2. Poppet 4. Poppet. Insert locking screw /A26, A49 6 / B6 4. Insert. Insert 5. Adjustable screw 5. Adjustable screw 6. Locking screw 6. Locking screw. Spring. Spring SS2/A 8. Oring 8. Oring FKM, Optional FFKM NBR 9. Inlet gasket. Outlet gasket TFE coated SS6 4

5 VA Series Ordering Information and Dimensions Basic Ordering Number mm L inch Hex VAA VAB F4N M4N M4R M8N M8R /4 in. Female NPT /4 in. Male NPT /4 in. ISO Male Tappered /2 in. Male NPT /2 in. ISO Male Tappered /4 9/6 9/6 /8 /8 VDA Series Ordering Information and Dimensions Dimensions mm(inch) Basic Ordering Number Inlet Outlet L H h D4TS /4 in. DKLOK 82.(.2) 9/6 in. D6MS 6mm DKLOK 82.(.2) 4mm VDA. 5/8 in. D8MS 8mm DKLOK 84.(.2) 6mm MD4N4TS /4 in. Male NPT /4 in. DKLOK 9.2(.2) 9/6 in. Table. VA & VDA Series Spring Cracking Pressure Range Designator Cracking Pressure C ( F) g Bar to 5.2 to.4 5 to 5.4 to. 5 to 5. to to to 4. Designator Cracking Pressure vs. Reseal pressure VA and VDA Series valves set to crack at 2 g(. ) or lower may require back pressure(downstream pressure) to reseal the valve bubble tight. Example shown : For a valve set to crack at (45 g), the minimum reseal pressure would be 2 (9g). How to adjust cracking pressure Step Step 2 Step Adjustable screw Locking screw Adjustable screw Locking screw Locking screw INLET Allen key INLET INLET OUTLET Sllghtly unscrew the locking screw counterclockwise. OUTLET. 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 counterclockwise. OUTLET. Move out the allen key up to the locking screw position. 2. To lock out the locking screw, turn the allen key clockwise. 5

6 VH6 Series High Pressure Check Valves VCH6 Series CNG/NGV Check Valves Features High pressure 6 g (4 batr) Seal blowout proof design with the bonded seal on poppet. Seal Kit INLET OUTLET H L L h Materials of Construction. Body 2. Connector. Poppet stop 4. Poppet with bonded seal 5. Spring 6. Indicator ring*. Oring 8. Backup ring 9... DkLok Front & Back Ferrule and Nut Wetted parts are listed in blue. *Indicator ring bears the information of spring designator. Lubrication: Siliconbased Lubricant on Poppet Molybdenum Dry Film Lubricant on SS6 Connector threads Valve Body Material SS6 /A49, A26 Poppet : SS6 /A49, A26 Bonded Seal : FKM, optional EPDM & Kalrez HNBR standard for VCH6 series. SS2 /A SS6 /A26 FKM. HNBR standard for VCH6 Series. PTFE /D SS6 /A49, A26 CNG Certifications VCH6 Series check valve with CNG compatible HNBR Oring are available with CNG certifications. ANSI / AGA NGV.995 Certificates ECE R ISO 55 CGV NGV 2.M95 Certificate No. Classification Temperature Working Pressure R86 Class 4 to 2 C (4 to 25 F) 2 C 2REPORT4 () Check valve 4 to 2 C (4 to 25 F) 2 C 2REPORT () Check valve 4 to 2 C (4 to 25 F) 2 C 6

7 VH6 Series Ordering Information and Dimensions Note: The basic ordering numbers indicated in blus are not for CNG/NGV applicable VCH6 Series vavlves. M4N D6T D8T D8M DM D2M F6N F8N M6N M8N D2T D6T D22M D25M F2N F6N M2N M6N VH6A VCH6A VH6B VCH6B VH6C VCH6C Basic Ordering Number D2T M2N D4T D6M F4N /8 in. DkLok /4 in. DkLok 6 mm DkLok /4 in. Female NPT /8 in. Male NPT /4 in. Male NPT /8 in. DkLok /2 in. DkLok 8 mm DkLok mm DkLok 2 mm DkLok /8 in. Female NPT /2 in. Female NPT /8 in. Male NPT /2 in. Male NPT /4 in. DkLok in. DkLok 22 mm DkLok 25 mm DkLok /4 in. Female NPT in. Female NPT /4" Male NPT in. Male NPT L 5. ( 2.2) 6. ( 2.4) 6. ( 2.4) 54. ( 2.) 45.5 (.9) 55. ( 2.) 69.9 (2.5) 5.2 (2.96) 68.6 (2.). (2.8) 5.2 (2.96) 64.8 (2.55). (.) 59.9 (2.6) 69. (2.) 89.4 (.52) 98.6 (.88) 88.4 (.48) 98.6 (.88) 82. (.2) 9. (.8) 8.6 (.29) 9.2 (.6) Dimensions mm ( inch) L H 26.4 (.4) 26.4 (.4) 26.4 (.4) 26.4 (.4) 26.4 (.4).2 (.2).2 (.2).2 (.2).2 (.2).2 (.2).2 (.2).2 (.2) 45.2 (.8) 45.5 (.9) 45.5 (.9) 45.5 (.9) 82. (.2) 9. (.8) 45.5 (.9) 45. (.8) /6 9/6 4 /6 / /8 /2 2 4 h /6 /6 5/8 Pressure Rating g ( ) 6 ( 4) 6 ( 4) 5 ( 44) Table 4. Spring Cracking, Reseal and Back F (2 C) Spring Nominal Cracking Pressure Designator / Cracking Pressure Ranges Reseal Pressures Min. Pressure Max. Pressure ().2 Up to 6 (.4) back pressure Up to 5 (.5) back pressure Up to 2 (.4) back pressure Minimum (.2) Reseal pressure Minimum (.2) Reseal pressure Sour Gas Service Materials of VH6 series valves for sour gas service are selected in accordance with the requirements of NACE MR5 Spring: alloy X5/AMS5699 Nominal Cracking Pressure: /,, and 5 (.,. and.5 ) Seal: ethylene propylene. To order, insertsg in the ordering number. i.e., VH6BD8TSGS How to Order Select valve basic ordering number, applicable seal, spring nominal cracking pressure, and body material. VAD4T BN / S VPBF8N VT B VH6CD6T EP S Seal Material Designator Spring Nominal Cracking Pressure Designator Valve Body Material Designator FKM: Nil for SS6 Valve NBR: Nil for Valve HNBR: Nil for VCH6 CNG valves FKM: VT NBR: BN EPDM: EP FFKM: KZ /: / : : : 25: 25 Note: Select the spring designator from Table, 2, and 4 of each valve Series. S: 6 stainless steel B:

8 Spare Kits for Field Assembly Spring Prefix "9SPR" and select an applicable valve series and the designator of the spring nominal cracking pressure. 9SPR(Valve series)(spring designator)2 Example: 9SPRVA/2 How to order VH6 Series spring kit. VH6 spring kit contains a spring and an indicator ring. Select an applicable valve series and the designator of the spring nominal cracking pressure. (Valve series)ringspr(spring designator)sa Example:VH6ARINGSPR5SA VL6 Series Lift Check Valves Features Working pressure up to 6 g (4 ) Temperature up to 9 F (482 C) Metal to metal seat Oring Prefix "9ORG", select an applicable valve series and seal material designator. Example: 9ORGVABN How to order VH6 Series seal kit. VH6 seal kit contains (Refer to VH6 Materials of Construction) #4. Poppet with bonded seal, #. Oring and #8. Backup ring. Select an applicable valve series and seal material designator SK(valve series)(seal material designator) Examples: SKVH6AVT, SKVH6BBN. Operation Operation of this valve heavily depends on gravity assistance. Thus mounting horizontally with bonnet nut upward to allow poppet to operate vertically. Reverse flow closes the valve, keeping poppet in the orifice. Forward flow opens the valve, lifting the poppet Lift check valve is primarily for use in liquid systems. If a slight amount of leakage can be tolerated it can be used with heavy gases. Reverse flow is limited to less than.% of forward. Materials of Construction Body 2 Bonnet Nut Bonnet 4 Poppet Valve Body Material SS6/A26 or A49 SS6/A26 or A49 TYPE6/A564 SS6/A26 or A49 Complete Ordering Number and Dimensions Complete Ordering Number End Connection Orifice mm inch D4TS /4 in. DKLOK D6MS 6 mm DKLOK 6. (2.4) VL6A F2NS /8 in. Female NPT (2.) F4NS /4 in. Female NPT SW4TS /4 in. tube socket weld 46. (.8) D6TS /8 in. DKLOK.9(2.8) VL6B F4NS /4 in. Female NPT SW6TS /8 in. Tube Socket Weld 5.2 (2.25) SW8TS /2 in. Tube Socket Weld D8TS VL6C /2 in. DKLOK F6NS /8 in. Female NPT D2TS /4 in. DKLOK F8NS /2 in. Female NPT 99.6 (.92) 9.2(.2) SW8TS /2 in. Tube Socket Weld 9.5 (.) How to order: Select a complete ordering number. i.e., VL6AD4TS. Dimensions mm (in.) L H H Hex. (.4) 4. (.85) 62. (2.44) 9.9 (.9) 2. (.5) 5. (.62) /8 /4 /2 PressureTemperature Ratings ASME Class Material Group Material Name Tem p. F ( C) 65 to (5 to ) 2 (9) (48) 4 (24) 5 (26) 6 (5) () 8 (426) 9 (482) SS6 Working Pressure g () 6 (4) 56 (55) 466 (2) 428 (294) 98 (24) 6 (259) 6 (248) 46 (28) 28 (225) All dimensions shown are for reference only and subject to change. Dimensions with DKLOK are in fingertight position. We reserve the right to change specification stated in this catalog for our continuing program of product improvemenr. 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 responsibillty of the system designer and the user. Dk Tech accepts no liability for any improper selection, installation, operation or maintenance.