D-Pro Check Valves. SS316: 2000 psig (137 bar) Brass: 1500 psig (103 bar)

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2 DPro V, VP, VA, V6 and V6 Series Fixed and Adjustable cracking pressure Pressures up to (6 ) and 6 (4 ) Catalog No V66. May 8 Features Fixed and adjustable cracking pressure. Reliable DKOK Tube Fitting, NPT and ISO pipe end connections. Stainless and rass material construction. Technical Information Valve Series V Series VA, V, VC and VD VE and VF VP Series VA Series V6 Series VAA and VP VAA and VA V6A and V6 V6C Maximum Operating (7 ) & rass psi (6 ) : (7 ) rass: ( ) & rass psi (6 ) & rass psi (6 ) 6 psi (4 ) psi (44 ) Operating Temperature Ratings FKM Oring: 8 F to 4 F ( 8 C to 4 C) Oring: 4 F to F ( C to C) Refer to spring table of each valve sereis Cracking, Reseal 7 ( ) : Valve poppet is actuated when the pressure difference between the inlet and the outlet reaches the range of cracking pressure. Reseal 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 (.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 Ratings are based on FKM Orings of valves and Orings of rass valves Valve Series VA, V, VC, VD, VAA, VA, VPA, and VP Series VE and VF Series V6A, V6, and V6C Series Temperature 8 to F (8 to 8 C) F (9 C) F (7 C) F ( C) F (48 C) F (76 C) 7 F (9 C) 4 F (4 C) ( 6) 7 ( 77) ( 7) 4 ( 68) ( 6) ( ) 8( ) Working Pressure, ( ) rass rass V6A & V6 V6C ( 6) 6 ( 79) ( 7) ( 7) 7 ( 8) 67 ( ) 6 ( ) 4 ( 6) 49( ) 4( 99) ( ) ( 89) ( 86) 6 ( 4) 6 ( ) ( 46) 49 ( 8) 466 ( ) 447( 8) 47( ) 48( 94) ( 44) 49 ( 9) 48 ( 88) 48 ( 8) 87 ( 67) 7 ( 6) 64( ) 6( 4) Operation When the valve is not actuated for a period of time, it may require a higher cracking pressure than the set cracking pressure. DPro check valves prevent reverse flow in circuits. Do not use them as relief valves. DPro 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. Valve Cleaning and Factory Test V series Working pressure up to (6 ) Model Shown: V Series VCD8TS VCF6NEP/S Every valve is cleaned, and packed in a plastic sealing bag to keep them from dust in the air, and then boxed for protection from damage during transportation and storage. Every valve is factory tested for cracking and reseals performance. TE POWER OF REIAIITY DK TEC CORPORATION

3 DPro V Series Feature: Working pressure up to (6 ). ody. Connector. Poppet 4. Oring*. Spring 6. Oring seal /A76, A479 FKM, optional EPDM, Kalrez. FKM, optional EPDM, Kalrez. Wetted parts are listed in blue. *4. Oring is secured in VE, VF series. Valve ody Materials Material Grade/ASTM ubrication: Siliconbased ubricant for Poppet Molybdenum Dry Film ubricant for ody Threads rass 6 /6 V Series Ordering Information and Dimensions asic Ordering Number DT MN FN VA D4T D6M MD4N4T M4N F4N D6T V DM M6N F6N D8T VC DM M8N F8N VD DT DT VE MN FN D6T VF M6N F6N End Connections Orifice Dimensions mm ( inch) Inlet Outlet mm ( in. ) hex ex l.6. ( 7/6).6 (.9) 44.4 (.7) 46. (.8) /8 in. Dkok /8 in. Male NPT /8 in. Female NPT /4 in. Dkok 6 mm Dkok /4 in. Male NPT /4 in. Dkok /4 in. Male NPT /8 in. Dkok mm Dkok /8 in. Male NPT /8 in. Female NPT / in. Dkok mm Dkok / in. Male NPT / in. Female NPT /8 in. Dkok /4 in. Dkok /4 in. Male NPT /4 in. Female NPT in. Dkok in. Male NPT in. Female NPT 4.8 (.9) 7. (.8). (.9). (.) 6. (.6) 8. (.7) ( /8) 9. ( /4). ( 7/8) 8.8 ( /8).7 ( /4) 4.9 ( /8) 4.8 ( /8) 4.9 ( 9/6) ( 9/6) 7.46 ( /6) 9.. ( 7/8)..4 ( ) 8.8( /8) 8. ( /) All dimensions shown are for reference only and subject to change. Dimensions with DKOK are in fingertight position. 6. (.6) 6.4 (.).4 (.) 6.8 (.4) 6. (.8). (.9) 6.8 (.) 8. (.6) 74.4 (.9) 84.7 (.) 9.8 (.6).7 ( 4.). ( 4.). ( 4.6). ( 4.77) 6. ( 4.7).4 ( 4.9). (.98). (.98) 7. (.7) 6. (.4) 48. (.89) 67. (.64) 68.4 (.69) Table. Spring Cracking, Reseal 7 ( ) Spring Nominal psi / Ranges Min. Pressure Max. Pressure Reseal Pressures Up to 6 Up to Up to Copyright 8. DK Tech Corporation. All rights reserved.

4 DPro VP Series Features: Oring seal blowout proof design One piece body construction. Working pressure up to (6 ). ody. Poppet. Oring older 4. ocking Screw. Oring 6. Spring Wetted parts are listed in blue. /A76, A479 FKM, optional EPDM, Kalrez Valve ody Materials Material Grade/ASTM rass 6 /6 ubrication: Siliconbased ubricant on Poppet Molybdenum Dry Film ubricant on ocking Screw. VP Series Ordering Information and Dimensions asic Ordering Number VPA VP M4N M4R F4N F4R MF4N FM4N M8N F8N MF8N End Connections Inlet Outlet /4 in. Male NPT /4 in. ISO Male Tapered /4 in. ISO Female Tapered /4 in. Male NPT /4 in. Male NPT / in. Male NPT / in. Female NPT / in. Male NPT / in. Male NPT All dimensions shown are for reference only and subject to change... Dimensions mm ( inch) 4 (.6) 6 (.4) 64 (.4) 44 (.7) 8 (.8) 8 (.8) 94 (.7) 7 (.8) ex. 4.8 ( 9/6) 9. ( /4). ( 7/8) 6.98 ( /6) Table. Spring Cracking, Reseal 7 ( ) Spring Nominal Psi / Psig VA Series Adjustable Ranges Min. Pressure Max. Pressure Psig Psig Up to 6 Up to 7 Reseal Pressures Features Working pressure up to (6 ) Cracking pressure adjustable from to 6 (. to 4. ). ody. Poppet. Insert locking screw 4. Insert. Adjustable screw 6. ocking screw 7. Spring 8. Oring Valve ody Materials Material Grade/ASTM /A76, A479 FKM, optional EPDM, Kalrez rass 6 / 6 Wetted parts are listed in blue. ubrication: Siliconbased ubricant on Poppet Molybdenum Dry Film ubricant on ocking Screw and Insert ocking Screw.

5 VA Series Ordering Information and Dimensions asic Ordering Number End Connections ex Range mm C (7 F) VAA F4N M4N M4R /4 in. Male NPT /4 in. ISO Male Tappered /4 9/6 9/6 to to ar. to.4.4 to. VA M8N / in. Male NPT /8 to. to 4.. M8R / in. ISO Male Tappered /8 to 6 4. to 4. All dimensions shown are for reference only and subject to change. Dimensions with DKOK are in fingertight position. ow to Order To complete ordering number, add adjustable spring designator to the basic ordering number and then specify valve material designator. ody material designators: S for, for rass. Example: VAAF4NS ow to adjust cracking pressure Table. Spring Range Desingntor Step Step Step Adjustable screw ocking screw Adjustable screw ocking screw ocking screw INET Allen key INET INET Sllghtly unscrew the locking screw counterclockwise. V6 Series OUTET OUTET OUTET. Gently slide the allen key up to adjustable screw position. Features igh pressure 6 (6 ) Seal blowout proof design with the bonded seal on poppet.. Adjust cracking pressure. To increase cracking pressure, turn adjustable screw clockwise. To decrease cracking pressure, turn adjustable screw counterclockwise.. Move out the allen key up to the locking screw position.. To lock out the locking screw, turn the allen key clockwise. Models Shown: V6D8TS V6CFNKZS INET h OUTET. ody. Connector. Poppet stop 4. Poppet with bonded seal. Spring 6. Indicator ring* 7. Oring 8. ackup ring 9... Dkok Front & ack ferrule, Nut Valve ody Materials Material Grade/ASTM /A479, A76 FKM, optional EPDM SS /A /A76 FKM PTFE /D7 /A479, A76 Wetted parts are listed in blue. *Indicator ring bears the information of spring designator. ubrication: Siliconbased ubricant on Poppet Molybdenum Dry Film ubricant on Connector threads Table 4. Spring Cracking, Reseal 7 ( ) 4 Psi / Spring Nominal Min. Pressure Ranges Max. Pressure Psig Up to 6 Up to Up to 7 Reseal Pressure

6 Optional Features Seal Materials Oring Seal Material FKM EPDM Kalrez* V6 Series Ordering Information and Dimensions M6R V6A V6 V6C asic Ordering Number DT D4T D6M F4N MN M4N F4R M4R D6T D8T D8M DM DM F6N F8N M6N M8N F8R M8R DT D6T DM DM FN F6N MN M6N FR F6R MR All dimensions shown are for reference only and subject to change. Dimensions with DKOK are in fingertight position. N VT EP KZ /8 in. Dkok /4 in. Dkok 6 mm Dkok /8 in. Male NPT /4 in. Male NPT /4 in. ISO Female Tapered /4 in. ISO Male Tapered /8 in. Dkok / in. Dkok 8 mm Dkok mm Dkok mm Dkok /8 in. Female NPT / in. Female NPT /8 in. Male NPT / in. Male NPT / in. ISO Female Tapered / in. ISO Male Tapered /4 in. Dkok in. Dkok mm Dkok mm Dkok /4 in. Female NPT in. Female NPT /4" Male NPT in. Male NPT End Connections /4 in. ISO Female Tapered in. ISO Female Tapered /4 in. ISO Male Tapered in. ISO Male Tapered Temperature Rating 4 to ( to ) 8 to 4 (8 to 4 ) 49 to 7 (4 to ) to 99 ( to ) (.7) 6.7 (.4) 6.7 (.4) 4. (.) 4. (.79). (.7) 7.9 (.8). (.7) 69.9 (.7) 7. (.96) 68.6 (.7) 7. (.8) 7. (.96) 64.8 (.) 77. (.) 9.9 (.6) 69. (.7) 8.6 (.9) 69. (.7) 89.4 (.) 98.6 (.88) 88.4 (.48) 98.6 (.88) 8. (.) 97. (.8) 8.6 (.9) 9. (.67) 9. (.) 97. (.8) 8. (.) 9. (.67) 6.4 (.4) 6.4 (.4) 6.4 (.4) FKM is standard for valves is standard for rass valves *Kalrez: TM Dupont Dimensions mm ( inch) 6.4 (.4) 6.4 (.4) 6.4 (.4). (.). (.). (.). (.). (.). (.). (.). (.) 4. (.78) 4. (.79) 4. (.79) 4. (.79) 8. (.) 97. (.8) 4. (.79) 4.7 (.8) 9. (.) 97. (.8) 4. (.79) 4.7 (.8) 7/6 9/6 4 /6 7/8 6 9 /8 / 4 h /6 /6 /6 /8 Pressure Rating ( ) 6 ( 4) 6 ( 4) ( 44) ow to Order Select valve basic ordering number, applicable seal, spring nominal cracking pressure, and body material. VAD4T VPF8N V6CD6T N VT EP / S S Seal Material : Nil for rass Valve : N FKM: Nil for S6 Valve FKM: VT EPDM: EP Kalrez: KZ Spring Nominal Cracking Pressure /: / psi : psi : psi : psi : psi Note: Select the spring designator from Table,, and 4 of each valve series. Valve ody Material S: 6 stainless steel : rass

7 Spare Parts for Field Assembly Spring Kit To order spring kit, prefix 9SPR,select check valve series and spring nominal cracking pressure designator. Examples; 9SPRVA/: / spring for VA series 9SPRVP: spring for VP series 9SPRV6A: spring for V6A series Seal Kit To order seal kit, prefix CVO,select valve series and seal designator. Examples; CVOVAN: Oring for VA series CVOVPVT: FKM Oring for VP series. CVOV6AVT: FKM bonded seal for V6A series Note: Seal kit for VE/F series and V6A//C series are supplied with the poppet. V6 Series ift Operation Operation of this valve heavily depends on gravity assistance. Thus mounting horizontally with bonnet nut upward. Reverse flow closes the valve by keeping poppet in the orifice. Forward flow opens the valve by lifting the poppet. Features Working pressure up to 6 (4 ) Temperature up to 9 F (48 C) Metal to metal seat Material of Construction ody onnet Nut onnet 4 Poppet Grade/ASTM Specification /A76 or A479 /A76 or A479 SS74/A64 /A76 or A479 Complete Ordering Number and Dimensions Complete Ordering Number V6A V6 V6C D4TS D6MS FNS F4NS SW4TS D6TS F4NS SW6TS SW8TS D8TS DTS F6NS F8NS SW8TS End Connection /4 in. DKOK 6 mm DKOK /8 in. Female NPT /4 in. tube socket weld /8 in. DKOK /8 in. Tube Socket Weld / in. Tube Socket Weld / in. DKOK /4 in. DKOK /8 in. Female NPT / in. Female NPT / in. Tube Socket Weld Orifice mm inch All dimensions shown are for reference only and subject to change. Dimensions with DKOK are in fingertight position Dimensions mm (in.) ex 6. (.4).8 (.) 46. (.8) 7.9(.8) 7. (.) 99.6 (.9) 79.(.) 79. (.) 7. (.47) 47. (.8) 6. (.44) 9.9 (.9).7 (.).7 (.6) 7/8 /4 / PressureTemperature Ratings ASME Class Material Group Material Name Tem p. F (C) 6 to ( to 7) (9) (48) 4 (4) (6) 6 () 7 (7) 8 (46) 9 (48). Working Pressure () 6 (4) 6 () 466 () 48 (94) 98 (74) 76 (9) 6 (48) 46 (8) 8 () ow to order: Select complete ordering number. i.e., V6AD4TS. 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. TE POWER OF REIAIITY DK TEC CORPORATION DK TEC Trademarks Mailing Address 86, NaesamRi, JuchonMyeon, GimhaeCity, Gyeong Nam, Korea 684 DK TEC contact information Tel. (8) 84 Fax (8) sales@dklok.com For Dkok International USA customers Tel. (8) 8/ Fax (8) dklok@dklok.com

8 V6/V66 Series Relief Valves Working pressure (6 ) and 6 (4 ) Catalog No. V6/V66 Jan.7 Cap Plug Cracking pressure adjusting Cap V6 yellow label identifies the loaded spring Adjustable spring for a specific cracking pressure ocking Nut Wire locking hole onnet Poppet Stem seal ody V6 Series for working pressure (6 ) Oring seal Cap Plug Inlet Outlet V66 Series for working pressure 6 (4 ) Orifice: 4.8 mm (.9 in.) =.6 Technical Data V6 Series Technical Data Maximum working pressure: (6 ) Cracking pressure range: to (.68 to 7. ) Table. V6 Series Spring Spring Color Code RVS to.68 to 7. Red V6/66 Series Temperature Rating Seal Material Viton (Standard) una N Ethylene Propylene (EPDM) Temperature Rating ( ) 8 ~ 4 ( ~ 4) ~ (68 ~ ) 4 ~ (49 ~ 7) Cracking pressure adjusting cap V66 red label identifies the loaded spring Adjustable spring for a specific cracking pressure V66 Series Technical Data Maximum working pressure : 6 (4) Orifice size: 4.8 mm (.9 in.) =.4 Cracking pressure range : to 6 (.4 to 4) ocking Nut Wire locking hole onnet Outlet Table. V66 Series Spring Spring Color Code Spring Color Code Poppet RVSA to.4 to 4 White RVSE to to 6 Green Stem seal ody Inlet RVS RVSC to 7 7 to 4 to.6.6 to lue Clear RVSF RVSG to 4 4 to 6 to 7 7 to 44 Yellow rown Oring seal RVSD to to lack RVS to 6 44 to 4 Orange V6 Series Flow Rate AIR Inlet pressure, WATER Inlet pressure, Flow rate, std ft/ min....9 ( ). ( ) 6.7 ( ).7 ( ).68 ( )....9 ( ). ( ) 6.7 ( ).7 ( ).68 ( ) Flow rate, std /min Flow rate, gal/min Inlet pressure, Inlet pressure, V66 Series Flow Rate AIR Inlet pressure, WATER Inlet pressure, 4. A G F E D C A.8 ( ) Flow rate, std ft/ min D9.9 (87 ) C 77. ( ) CRACKING PRESSURE F A A 4. ( ) E8.9 (6 ) 7.9 ( ).78 ( ).44 ( ) SPRING DESIGNATOR Flow rate, std /min Flow rate, U.S. gal/min ( ). (4 ) 4. ( ) 8.9 (6 ) 9. (87 ) 77. ( ) 7.9 ( ).78 ( ) CRACKING PRESSURE G 79.4 ( ). (4 ) Inlet pressure, Inlet pressure,. Flow rate, /min SPRING DESIGNATOR. Flow rate, sstd /min Factory Test Every valve is factory tested for cracking and reseal performance. TE POWER OF REIAIITY DK TEC CORPORATION

9 ow To Adjust Valve The valve user shall set a specific cracking pressure of the valve supplied.. To increase the cracking pressure of the valve, turn the adjusting cap clockwise to compress the spring.. To reduce the pressure, turn counterclockwise.. Start the pump with the spring relaxed (eight threads showing with the ocking Nut at bottom), with the discharging port open, check the gauge pressure as you turn the adjusting cap clockwise to increase the pressure to the desired operating range. 4. If the system has more than one outlet, set the valve pressure with one outlet open, and then check again with all outlets open to make sure that the set pressure is within the desired operating range.. Set the ocking Nut and the wire to maintain the set cracking pressure. Operation Install the valve between the pump outlet as close as possible, and any shutoff device in the discharge line. The preferable mounting position is vertical with the adjusting cap at the top. DPro relief valve bypasses the system fluid to prevent instrument or sensitive gauge in the system from excess pressure. When the inlet pressure overcomes the set spring pressure on the poppet, the poppet lifts off the valve seat, allowing flow to bypass and thereby balance the system pressure. If the valve has not been actuated for a long time, it may initially crack above the set cracking pressure. Cracking pressure is only sensitive to inlet pressure, and is not affected by outlet pressure. reduction: Valve flow may be reduced by the restriction of pipe and tubing connected. inlet outlet Safe Valve Selection Max Ordering Information and Table of Dimensions and asic Ordering Number V6 V66 D4T D6M D8M D8T DM MD8N8T MD8NM MF4N MF4R MF6N MF6R MF8N MF8R Inlet / Male NPT / Male NPT /4 Male NPT /4 Male ISO 7/ /8 Male NPT /8 Male ISO 7/ / Male NPT / Male ISO 7/ inlet End Connections /4 Dkok 6 mm Dkok 8 mm Dkok / Dkok mm Dkok outlet Outlet / Dkok mm Dkok /4 Female NPT Max /4 Female ISO 7/ /8 Female NPT /8 Female ISO 7/ / Female NPT / Female ISO Orifice mm ( in. ) 4.8 (.9) Dimensions mm (in.) (.9) ( 4.) 98 (.8) 94 (.7) 98 (.8) 7 (.4) 8 (.49) 44 (.7) 6 (.4) (.) 6 (.4) All dimensions shown are for reference only and are subject to change. Dimensions with Dkok nuts are in fingertight position. 9 (.) 4 (.7) 4 (.6) 4 (.6) (.8) (.7) 8 (.49) Model Shown: V66D8TS ow To Order Please select the desired valve basic ordering number, the applicable seal, spring designator and CE certified option from the table below. Example: V66D4T N S CE Seal Material Spring ody Material CE certified Nil: Standard Viton* N: una N EP: EPDM Refer to Table, Table for spring designator S: S6 Ti: Titanium Cap Plug Adjusting Cap CE: valve to 97//EC 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. Spring ocking Nut onnet Poppet Stem & Oring seal ody *Viton: TM of DUPONT Polypropylene S6/ ASTM A76, A P SS/ AMS 678 D S6/ ASTM A479, A76 Standard Viton*, optional EPDM and una N F6/ ASTM A8 Factory pressure set valve To order, specify the set pressure on the valve ordering number. Example: V66D4T6 S, or V66D4T87 psis Factory Pressure Set Relief Valve Valve without spring installed Note : This label is on the adjusting cap To order, do not specify spring designator on the ordering number. Example: V66D4TS. CAUTION : NO SPRING INSTAED Note : This label is on the adjusting cap Spring for field assembly To order, select an applicable spring from the spring designator table &. Example : RVSA TE POWER OF REIAIITY DK TEC CORPORATION DK TEC Trademarks Mailing Address 86, NaesamRi, JuchonMyeon, GimhaeCity, Gyeong Nam, Korea 684 DK TEC contact information Tel. (8) 84 Fax. (8) sales@dklok.com For International customers Tel. (8) 8/ Fax. (8) dklok@dklok.com