DatasheetsPDF.com

SOBD5A-R4 Dataheets PDF



Part Number SOBD5A-R4
Manufacturers ARGO-HYTOS
Logo ARGO-HYTOS
Description Overcentre Valve
Datasheet SOBD5A-R4 DatasheetSOBD5A-R4 Datasheet (PDF)

Overcentre Valve Fully Balanced SOBD5A-R4/l HA 5208 7/2008 M27 x 1,5 • pmax 350 bar • Qmax 90 L/min q The valve prevents runaway in the event of a nega- tive load Replaces HA 5208 9/2006 q Load-holding with minimal leakage q Pressure relief function protecting the actuator against overload and pressure peaks q When installed into the actuator the valve can be used as a hose burst valve q When used as pressure relief the check valve will act as an anti-cavitation valve q Relief setting is.

  SOBD5A-R4   SOBD5A-R4


Document
Overcentre Valve Fully Balanced SOBD5A-R4/l HA 5208 7/2008 M27 x 1,5 • pmax 350 bar • Qmax 90 L/min q The valve prevents runaway in the event of a nega- tive load Replaces HA 5208 9/2006 q Load-holding with minimal leakage q Pressure relief function protecting the actuator against overload and pressure peaks q When installed into the actuator the valve can be used as a hose burst valve q When used as pressure relief the check valve will act as an anti-cavitation valve q Relief setting is unaffected by back pressure q The valve should be mounted as close as possible to the actuator Functional Description The valve consists of a seat by-pass, relief valve fitted with an auxiliary control with a differential piston and by-pass single-way valve serving for reverse direction of flow. The liquid is flowing through the single-way valve from the channel (2) to the channel (1) with a small pressure drop. In the opposite direction the single-way valve on the rear side of which a gate valve seat is fitted is pressed through the action of a spring and the load pressure against the spring-loaded valve gate valve. In this way the valve is nearly closed hermetically. If the pressure in the channel (1) exceeds a set up value of the spring force the gate valve is pressed out of the seat and the overpressure in that case is relieved into channel (2). For ensuring the function of holding the load the spring force should be set up to a value by 30 % higher when compared to an expected pressure exerted by the load. If the load has to be moved it is possible to ensure it with the help of so called auxiliary control from the channel (3) by introducing already certain control pressure. The control pressure is calculated in the following way: Control pressure = set up pressure – load pressure ratio of control The ratio of control designates a ratio of surfaces of the differential slide valve cross-section area and its seat. Therefore, the necessary control pressure for opening the valve does not correspond to the difference between the set up pressure and load pressure however; it corresponds to the ratio of this difference and the control ratio. In the formula as mentioned above it is necessary to take into consideration that in differential cylinders it is necessary to add to the control ratio also the appropriate ratio of piston surfaces in the direction of movement. As soon as the control pressure attains a necessary value the differential gate valve is moved out from the seat and then the way from the channel (1) to the channel (2) is released. If now the load tries to accelerate and be fast as for the oil supply the supply pressure decreases, therefore, also the control pressure in the channel (3) is decreased. The spring force tries to shut off the valve again, therefore, in consequence of which the flow from the consumer decreases and the inlet pressure to the consumer increases again. In this way it is ensured a constant inlet pressure by means of which the movement of the load can be controlled. Dynamic pressures in the outlet do not influence the set up value thanks to a special arrangement of the slide valve. However, it is necessary to take care of the fact the control channel is independent on the dynamic pressure. 23 ATVMEONSTFÉRA 1 1 HA 5208 Ordering Code Overcentre valve Fully Balanced SOBD5A-R4/l Preassare range Standard 4:1 4 No designation Seals NBR Technical Data Cavity Maximum flow Max. pressure Max. input pressure Pressure drops Hydraulic fluid Fluid temperature range Viscosity Maximum degree of fluid contamination Weight Maximum valve tightening torque in valve body or in control block Mounting position L/min bar bar bar °C mm2 /s kg Nm M27 x 1,5 90 270 350 see Dp - Q characteristics Hydraulic oil (HM, HV) according to DIN 51524 -20 ... +90 20 ... 400 according to ISO 4406 (1999), Class 21/18/15 0,29 60+2 any Pressure Dp [bar] Pressure Dp [PSI] Dp-Q Characteristics Measured at n = 40 mm2/s 0 16 14 12 10 8 6 4 2 0 0 Flow Q [US GPM] 6.5 13 19.5 26 240 210 FREE FLOW 180 150 120 90 PILOT OPEN 60 30 25 50 75 Flow Q [L/min] 0 100 2 Dimensions Measurements in millimeters HE6XHR55 HE6XH1R717 0.08 B 1.6 Cavity HE6XH3R232 V4ENT M27 x 1.5-6g M27 x 1.5-6g 3 2 1 Measurements in millimeters Æ 0.05 B Æ 0.05 B B Æ 0.08 A Æ 31.47 Æ 31.42 Æ 29.30 Æ 29.20 15° 30° M27x1.5-6H 1.6 1.6 R 0.20 0.10 45° 30° R 0.1 MAX Æ 4.00 MAX Æ 4.00 MAX 10.00 31.00 49.00 64.00 HA 5208 67.00 65.00 MIN REAM 55.00 33.50 29.00 3.30 3.05 13.00 1.00 30° 1.6 Æ 10.00 MAX 1.6 1.6 Æ 22.00 Æ 23.05 Æ 23.00 Æ 24.55 Æ 24.50 Æ 0.05 A -A- 3 HA 5208 Spare Parts Seal kits on request. Caution! Ÿ The packing foil is recyclable. Ÿ The technical information regarding the product presented in this catalogue is for descriptive purposes only. It should not be construed in any case as a guaranteed representation of the product properties in the sense of the law. ARGO-HYTOS s.r.o. CZ - 543 15 Vrchlabí Tel..


MS20605N SOBD5A-R4 3DG130


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)