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公开(公告)号：EP0894299B1
公开(公告)日：2000-08-30
申请号：EP97908262.5
申请日：1997-03-19
IPC分类号： G05D16/20 , G05D16/16 , F15B13/042
CPC分类号： G05D16/10 , F15B13/0402 , F15B13/0407 , Y10T137/2607 , Y10T137/2635
摘要： The invention pertains to a precontrolled 3-way pressure control valve with a direct-control pressure valve (45) as pilot valve (45) and with a main valve (9). In a valve housing (10) of the main valve (9) there is a valve bore (11) in which a control piston (12) is moved axially. Said control piston (12) is acted upon in opposite directions by pressures derived from the pressure in the control connection (A) and the pressure setting of the pilot valve (45) such that it experiences an imbalance of forces when the pressure at the control connection (A) deviates from the control pressure predetermined by the pressure setting of the pilot valve (45). To create a pressure control valve with a stable action, the control piston (12) is designed as a hollow piston with a hollow chamber (30), the wall of which has a number of oblong, axially running through-holes (32) distributed over the circumference of the control piston (12), enabling the individual connections (A, P, T) of the main valve to be combined. Furthermore, the valve is subject to low-pressure control, wherein control oil is removed at an axial end of the hollow chamber (30) in the control piston (12) and flows through a control nozzle (41) into a pressure chamber (42) in front of one end face of the control piston (12), connecting to the pilot valve (45) in the form of a pressure limiting valve (45). Pressure in the control connection (A) is applied to the control piston (12) against the pressure in this first pressure chamber (42) and the force of a spring (31) acting in the same direction.
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公开(公告)号：EP0894299A1
公开(公告)日：1999-02-03
申请号：EP97908262.0
申请日：1997-03-19
CPC分类号： G05D16/10 , F15B13/0402 , F15B13/0407 , Y10T137/2607 , Y10T137/2635
摘要： The invention pertains to a precontrolled 3-way pressure control valve with a direct-control pressure valve (45) as pilot valve (45) and with a main valve (9). In a valve housing (10) of the main valve (9) there is a valve bore (11) in which a control piston (12) is moved axially. Said control piston (12) is acted upon in opposite directions by pressures derived from the pressure in the control connection (A) and the pressure setting of the pilot valve (45) such that it experiences an imbalance of forces when the pressure at the control connection (A) deviates from the control pressure predetermined by the pressure setting of the pilot valve (45). To create a pressure control valve with a stable action, the control piston (12) is designed as a hollow piston with a hollow chamber (30), the wall of which has a number of oblong, axially running through-holes (32) distributed over the circumference of the control piston (12), enabling the individual connections (A, P, T) of the main valve to be combined. Furthermore, the valve is subject to low-pressure control, wherein control oil is removed at an axial end of the hollow chamber (30) in the control piston (12) and flows through a control nozzle (41) into a pressure chamber (42) in front of one end face of the control piston (12), connecting to the pilot valve (45) in the form of a pressure limiting valve (45). Pressure in the control connection (A) is applied to the control piston (12) against the pressure in this first pressure chamber (42) and the force of a spring (31) acting in the same direction.
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