Technical Information. Check Valves. E Check Valves. Selection Guide. Features. Crack Pressure. Applications E-4

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1 Technical Information Pressure at inlet port. Poppet is moved off seat. low is allowed through valve. Selection Guide Seat Poppet Rated Crack Body Size Material Pressure Pressure CV Series 1/4-1" Steel 3 PSI 5-13 PSI 1/4-1 1/4" Steel 5 PSI 5-2 PSI Inlet Port Outlet Port eatures Parker s Check Valves employ several unique features that insure years of trouble-free operation. Specific features for each series of check valves are listed within this section. Inlet Port Seat Poppet Pressure at outlet port. Poppet is against seat. low is blocked at seat. Outlet Port Crack Pressure Crack pressure refers to the amount of fluid pressure in the free flow direction required to move the poppet off the seat. The normal crack pressure setting is 5 PSI; however, other crack pressures are available to allow the check valve to perform special circuit functions, or operate under unique conditions. Check valves are not field repairable or adjustable. Crack pressure settings are made at the factory only. Check Valves pplications TYPICL HYDRULIC CIRCUIT. TH CHCK VLV IS USD TO PROTCT TH PUMP BY PRVNTING PRSSUR ROM RTURN- ING TO TH OUTLT PORT O TH PUMP. CHCK VLV PUMP TNK RLI VLV TNK CONTROL VLV CYLINDR Oil cooler bypass circuit. If return line pressure becomes excessive due to resistance through oil cooler (such as startup in cold weather). Check valve opens and allows oil to bypass the cooler and flow to the tank. The graphic symbol for a check-valve is: -4

2 Parker Check Valves Offer the eatures of a Compact Body Size, and 5 PSI Maximum Operating Pressure. The check valves utilize the dependable, internal design features found in Parker check valves, but with the added benefit and convenience of compact design. Sizes are available from 1/4" to 1-1/4" with six different itting Styles. The expands Parker's high quality product line of versatile and efficient check valves. eatures: 1. Compact Design. asy to plumb into tight circuits. 2. ll steel construction. No internal gaskets or seals to wear out. 3. One-piece body eliminates threads and seals that may be potential leakage points. 4. Smooth flow stream. Poppet spring is isolated from flow stream. 5. Heat treated poppet to resist damage from shocks and surges. 6. Variety of end fittings. 7. Optional crack pressures available from 1 to 2 PSI. 8. Zinc plated exterior finish. 9. Nitrile O-Ring included on MO and MS fittings. 1. Captive O-Ring Groove is standard on MS end fittings. DT-MM Male lare 37 JIC Inlet to Male lare 37 JIC Outlet DT-MMO Male lare 37 JIC Inlet to Male O-Ring Boss Outlet DT-MOM Male O-Ring Boss Inlet to Male lare 37 JIC Outlet Check Valves DT-MOMS Male O-Ring Boss Inlet to Male Seal-Lok Outlet DT-MSMO Male Seal-Lok Inlet to Male O-Ring Boss Outlet DT-MSMS Male Seal-Lok Inlet to Male Seal-Lok Outlet -5

3 Specifications The check valves have a Maximum Operating Pressure of 5 PSI. Standard Crack Pressures are 1, 5, and 65 PSI. Other Crack Pressures up to 2 PSI in 5 PSI increments are available upon request. DT-MM Male lare 37 JIC Inlet to Male lare 37 JIC Outlet 3/8 DT-37-MM-** 9/16-18 UN /16-18 UN.75 1, 5, 65 1/2 DT-5-MM-** 3/4-16 UN /4-16 UN.88 5, 65 5/8 DT-62-MM-** 7/8-14 UN /8-14 UN /4 DT-75-MM-** 1-1/16-12 UN /16-12 UN , 5, 65 1 DT-1-MM-** 1-5/16-12 UN /16-12 UN 1.5 5, /4 DT-125-MM-** 1-5/8-12 UN /8-12 UN , 5 DT-MMO Male lare 37 JIC Inlet to Male O-Ring Boss Outlet Check Valves 1/4 DT-25-MMO-** 7/16-2 UN /16-2 UN /8 DT-37-MMO-** 9/16-18 UN /16-18 UN.75 1, 5, 65 1/2 DT-5-MMO-** 3/4-16 UN /4-16 UN.88 5, 65 5/8 DT-62-MMO-** 7/8-14 UN /8-14 UN /4 DT-75-MMO-** 1-1/16-12 UN /16-12 UN , 5, 65 1 DT-1-MMO-** 1-5/16-12 UN /16-12 UN 1.5 5, /4 DT-125-MMO-** 1-5/8-12 UN /8-12 UN , 5 DT-MOM Male O-Ring Boss Inlet to Male lare 37 JIC Outlet 1/4 DT-25-MOM-** 7/16-2 UN /16-2 UN /8 DT-37-MOM-** 9/16-18 UN /16-18 UN.75 1, 5, 65 1/2 DT-5-MOM-** 3/4-16 UN /4-16 UN.88 5, 65 5/8 DT-62-MOM-** 7/8-14 UN /8-14 UN /4 DT-75-MOM-** 1-1/16-12 UN /16-12 UN , 5, 65 1 DT-1-MOM-** 1-5/16-12 UN /16-12 UN 1.5 5, /4 DT-125-MOM-** 1-5/8-12 UN /8-12 UN , 5-6

4 DT-MOMS Male O-Ring Boss Inlet to Male Seal-Lok Outlet 1/4 DT-25-MOMS-** 7/16-2 UN /16-18 UN /8 DT-37-MOMS-** 9/16-18 UN /16-16 UN.75 1, 5, 65 1/2 DT-5-MOMS-** 3/4-16 UN /16-16 UN.88 5, 65 5/8 DT-62-MOMS-** 7/8-14 UN UNS /4 DT-75-MOMS-** 1-1/16-12 UN /16-12 UN , 5, 65 1 DT-1-MOMS-** 1-5/16-12 UN /16-12 UN 1.5 5, /4 DT-125-MOMS-** 1-5/8-12 UN /16-12 UN , 5 DT-MSMO Male Seal-Lok Inlet to Male O-Ring Boss Outlet DT-MSMS Male Seal-Lok Inlet to Male Seal-Lok Outlet B C D 3/8 DT-37-MSMO-** 11/16-16 UN /16-18 UN.75 1, 5, 65 1/2 DT-5-MSMO-** 13/16-16 UN /4-16 UN.88 5, 65 5/8 DT-62-MSMO-** 1-14 UNS /8-14 UN /4 DT-75-MSMO-** 1-3/16-12 UN /16-12 UN , 5, 65 1 DT-1-MSMO-** 1-7/16-12 UN /16-12 UN 1.5 5, /4 DT-125-MSMO-** 1-11/16-12 UN /8-12 UN , 5 3/8 DT-37-MSMS-** 11/16-16 UN /16-16 UN.75 1, 5, 65 1/2 DT-5-MSMS-** 13/16-16 UN /16-16 UN.88 5, 65 5/8 DT-62-MSMS-** 1-14 UNS UNS /4 DT-75-MSMS-** 1-3/16-12 UN /16-12 UN , 5, 65 1 DT-1-MSMS-** 1-7/16-12 UN /16-12 UN 1.5 5, /4 DT-125-MSMS-** 1-11/16-12 UN /16-12 UN , 5 Check Valves -7

5 low Data 11 (1/4" & 3/8") Test luid: Oil - 2 SUS 1 (1/2", 5/8" & 3/4") Test luid: Oil - 2 SUS /4" (DT-25) 3/8" (DT-37) low in USGPM /2" & 5/8" (DT-5 / DT-62) 3/4" (DT-75) low in USGPM 2 (1" & 1-1/4") Test luid: Oil - 2 SUS 18 1 Check Valves " (DT-1) 1-1/4" (DT-125) low in USGPM Ordering Information DT- - - SRIS SIZ 25-1/4 37-3/8" 5-1/2" 62-5/8 75-3/4" 1-1" /4" CRCK PRSSUR 1-1 PSI 5-5 PSI PSI Other Crack Pressures up to 2 PSI in 5 PSI increments are available. Contact the Division for price and delivery on non-standard crack pressures ITTING STYL MM - Male lare Inlet to Male lare Outlet MMO - Male lare Inlet to Male O-Ring Boss Outlet MOM - Male O-Ring Boss Inlet to Male lare Outlet MOMS - Male O-Ring Boss Inlet to Male ace Seal Outlet MSMO - Male ace Seal Inlet to Male O-Ring Boss Outlet MSMS - Male ace Seal Inlet to Male ace Seal Outlet -8