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pilot operated check valve SV type
pilot operated check valve SV type
SV type Valves are pilot operated check valve in seat design that can be opened in blocking direction. Possible applications of these valves include blocking pressurized working circuits, preventing a load reduction in case of a line break or safeguarding against creep movements of hydraulically locked actuators. The valves basically consist of a housing , a seat poppet , a compression spring , a control spool as well as of a pre-opening as ball seat valve , which is optional. For safe opening of the valve via the control spool , a defined minimum pilot pressure is required. The SV type valve enables a free flow from A to B. In the opposite direction, the poppet (2) is held on the seat by the spring force and the system pressure. By pressurization at port X, the control spool (4) is moved to the right. The poppet (2) is pushed off the seat. Now, the valve can also be flown through from B to A. Type SV..A.. (with pre-opening) This valve is provided with an additional pre-opening. By pressurization at port X, the control spool (4) is moved to the right. As a result, the ball (5.1) is pushed off the seat first and the poppet (2) afterwards. Now, the valve can also be flown through from B to A. Due to the pre-opening, there is a damped decompression of the pressurized liquid. Thus, possible switching shocks are avoided.
- For subplate mounting
- Porting pattern according to ISO 5781
- Subplates according to data sheet 45062 (separate order)
- For threaded connection
- Pilot oil return, internal
- With or without pre-opening, optional
- Version with pre-opening for dampened release (reduction of potential switching shocks)
- 4 cracking pressures, optional
