1 ALLWEILER . Pressure relief valves, directly controlled Series DS/DT. Range of application The pressure relief valves of Series DS/DT can be ap- The branch current thus generated flows through space plied for maximum operating temperatures up to 150 C (B) or space (T) into the pump suction chamber or (higher temperatures on request). through the balance pipeline into the pressureless tank. The operating pressure decreasing to below the set The pressure relief valves can be applied for mineral opening pressure, the valve cone (8) closes the valve and synthetic hydraulic oils, lube oils and fuel oils. seat (i), and no further fluid pumped flows from space They are not to be used for corrosive, abrasive and con- (A) to space (B) and/or (T).
2 The operating pressure is taminated fluids. built up again in space (A). The exact operating data of the pressure relief valve such as pressures, maximum rate of flow and viscosity range can be taken from the data sheet. Structural Design Switching diagram according to DIN/ISO 1219. The valve casing (1) has a delivery side connection (A). and suction side connection (B) or connection (T) to the tank. The valve cone (8) is guided in the valve casing (1) and pressed onto the valve seat (i), metallically sealing, by means of the valve spring (29). The O ring (20) in the valve spring plate closes the pressure relief valve seal- ing to the outside. The opening pressure is adjusted by means of the ad- justing screw (17) and the valve spring (29).
3 The adjust- ing screw (17) is fixed in its position, checked by means of the hexagon nut (31). Mode of operation Through opening (A), the fluid pumped enters the valve casing where it is under a specific operating pressure pressing against the valve cone (8). The valve cone (8). is pressed onto the valve seat by means of the force of Operation the pretensioned valve spring (29), and closes the con- Operation with adjusting screw nection between space (A) and space (B). By means of the adjusting screw (17), the respective opening pressure is adjusted. The system pressure in space (A) overcoming the force Clockwise rotation: Pressure build up of the pre tensioned pressure spring (29), valve cone Counterclockwise rotation: Pressure reduction (8) is lifted off from the valve seat.
4 1. Series DS/DT. Abbreviation Pressure relief Material design valve Type of spring S = screw spring Max. opening pressure T = cup spring Flow Pressure Valve size max. l/min max. bar Type: A = built on, back to suction B = built on, back to suction with hand regulation C = built on, return to tank D = built on, return to tank with hand regulation E = Pipeline corner valve F = Pipeline corner valve with hand regulation * max. flow with pipeline valves Characteristics Type of construction Cone seat valve Flow range [l/min] 10 to 3600. Fluids Lube, hydraulic, fuel oils, oil in water emulsions Temperature range [ C] 20 to +150 (250 C on request). Viscosity range [mm2/s] 10 to 10000. Standard materials: Casing: GG / GGG / GS / ST.
5 Valve cone: GG / ST / MS. O rings: NBR / Viton VM 772 Ident Nr. 795 721 2. Series DS/DT. Types Type A Type B. Type C Type D. Type E Type F. VM 772 Ident Nr. 795 721 3. Series DS/DT. Sectional drawing with parts list Pressure relief valve, Series (Type A = built on, back to suction). Design with hand regulation Denomination Part No. Denomination Part No. Valve casing 1 Spindle nut 50. Cover 5 Guide bush 51. Valve spring plate 7 Valve spindle 52. Valve cone 8 O ring 53. Adjusting screw 17 Key 54. O ring 20 Circlip 56. Joint ring 26. Valve spring 29. Replacement parts/Spare parts Hexagon nut 31. Socket head cap screw 32. Screw plug 37. Socket head cap screw 44. O ring 48. VM 772 Ident Nr.
6 795 721 4. Series DS/DT. Valve dimensions and connections Type E/F. Type E. Type F. Inlet Outlet Dimensions Size Type Material VM 772 Ident Nr. 795 721 5. Series DS/DT. Valve dimensions and connections Type E/F. Casing material GG/GGG/GS. Type E. Type F Design with DS/DT44. Size Inlet Flange Outlet Flange Dimensions VM 772 Ident Nr. 795 721 6. Series DS/DT. Valve dimensions and connections Type E/F. Casing material welded steel Type E. Type F. Size Inlet Flange Outlet Flange Dimensions VM 772 Ident Nr. 795 721 7. Series DS/DT. Subject to technical alterations. A Member of the COLFAX PUMP GROUP. ALLWEILER AG S Werk Radolfzell Postfach 1140 S 78301 Radolfzell Allweilerstra e 1 S 78315 Radolfzell Germany Tel.
7 +49 (0)7732 86-0. Fax +49 (0)7732 86-436. E-mail: Internet: VM 772 Ident Nr. 795 721 8.