ALLWEILER Pressure relief valves, directly controlled Range of application The pressure relief valves of can be applied for maximum operating temperatures up to 150 C (higher temperatures on request). The pressure relief valves can be applied for mineral and synthetic hydraulic oils, lube oils and fuel oils. They are not to be used for corrosive, abrasive and contaminated fluids. The branch current thus generated flows through space (B) or space (T) into the pump suction chamber or through the balance pipeline into the pressureless tank. The operating pressure decreasing to below the set opening pressure, the valve cone (8) closes the valve seat (i), and no further fluid pumped flows from space (A) to space (B) and/or (T). The operating pressure is 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 The valve casing (1) has a delivery side connection (A) and suction side connection (B) or connection (T) to the tank. Switching diagram according to DIN/ISO 1219 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 sealing to the outside. The opening pressure is adjusted by means of the adjusting screw (17) and the valve spring (29). The adjusting 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 the pretensioned valve spring (29), and closes the connection between space (A) and space (B). The system pressure in space (A) overcoming the force of the pre tensioned pressure spring (29), valve cone (8) is lifted off from the valve seat. Operation Operation with adjusting screw By means of the adjusting screw (17), the respective opening pressure is adjusted. Clockwise rotation: Pressure build up Counterclockwise rotation: Pressure reduction 1
Abbreviation Pressure relief valve Material design of spring S = screw spring T = cup spring Max. opening pressure Valve size Flow max. l/min Pressure max. bar : 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 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 [mm 2 /s] 10 to 10000 Standard materials: Casing: GG / GGG / GS / ST Valve cone: GG / ST / MS O rings: NBR / Viton 2
s A B C D E F 3
Sectional drawing with parts list Pressure relief valve, Series DS.. ( A = built on, back to suction) Design with hand regulation Denomination Part No. Valve casing 1 Cover 5 Valve spring plate 7 Valve cone 8 Adjusting screw 17 O ring 20 Joint ring 26 Valve spring 29 Hexagon nut 31 Socket head cap screw 32 Screw plug 37 Socket head cap screw 44 O ring 48 Denomination Part No. Spindle nut 50 Guide bush 51 Valve spindle 52 O ring 53 Key 54 Circlip 56 Replacement parts/spare parts 4
Valve dimensions and connections E/F E F Size Material Inlet Outlet Dimensions 5
Valve dimensions and connections E/F Casing material GG/GGG/GS E F Design with DS/DT44 Size Inlet Flange Outlet Flange Dimensions 6
Valve dimensions and connections E/F Casing material welded steel E F Size Inlet Flange Outlet Flange Dimensions 7
Subject to technical alterations. A Member of the COLFAX PUMP GROUP ALLWEILER AG Werk Radolfzell Postfach 1140 78301 Radolfzell Allweilerstraße 1 78315 Radolfzell Germany Tel. +49 (0)7732 86-0 Fax +49 (0)7732 86-436 E-mail: service@allweiler.de Internet: http://www.allweiler.com 8