摘要:
A height control valve assembly having a housing (30) with an air supply port (76), first and second ports (72, 74), and an exhaust port. A valve (34) positioned in the housing (30) has a first surface in fluid communication with the air supply port (76) and a second surface. The valve (34) moves between first and second positions, in which the second surface sealingly engages a portion of the housing (30) surrounding the first and second ports (72, 74), respectively, to prevent fluid from flowing between the air supply port (76) and the first and second ports (72, 74), respectively. The valve (34) is moveable from either of the first and second positions to a fill position, in which the air supply port (76) is in fluid communication with one of the first and second ports (72, 74), and an exhaust position, in which one of the first and second ports (72, 74) is in fluid communication with the exhaust port.
摘要:
A change-over valve comprises a spool housed in a spool housing, and a pilot chamber facing at least an end of the spool. An axial passage is formed in the spool along the axial direction. While being connected to a pilot chamber, the axial passage communicates with a tank passage via a small hole having an opening on an outer periphery of the spool in accordance with displacement of the spool, to discharge the air in the pilot chamber to the tank passage. Since the axial passage is formed at a location offset from a center axis of the spool, a length of the small hole is shortened and the small hole is easily processed.
摘要:
A height control valve assembly having a housing (30) with an air supply port (76), first and second ports (72, 74), and an exhaust port. A valve (34) positioned in the housing (30) has a first surface in fluid communication with the air supply port (76) and a second surface. The valve (34) moves between first and second positions, in which the second surface sealingly engages a portion of the housing (30) surrounding the first and second ports (72, 74), respectively, to prevent fluid from flowing between the air supply port (76) and the first and second ports (72, 74), respectively. The valve (34) is moveable from either of the first and second positions to a fill position, in which the air supply port (76) is in fluid communication with one of the first and second ports (72, 74), and an exhaust position, in which one of the first and second ports (72, 74) is in fluid communication with the exhaust port.
摘要:
The invention relates to a driving stage for a two-stage servo valve, the driving stage being of the jet type, comprising an ejector (20) for ejecting a fluid jet and which is movable opposite a baffle (6) capable of generating a pressure differential that can be used to move a slide (3) of the servo valve. According to the invention, the ejector (20) radially projects from a column (21) to which the ejector (20) is rigidly connected, while being in fluid communication with a central opening (22) of the column through which fluid is supplied to the ejector, the column having a first end which is fitted onto the servo valve (23) and through which the fluid is fed into the column, and the column having a second end that is subjected to the load of a torque motor (26) for selectively twisting the column in one direction or the other about a starting position.
摘要:
There are provided: an on-off valve (7) which opens/closes flow between a first port (P) where compressed air is supplied and a second port (A) connected to an outside; and a delay mechanism (8) which opens the on-off valve (7) after a predetermined period of time has elapsed. The delay mechanism (8) includes: a throttle valve (22) communicatively connected to the first port (P); a piston (36) connected to the on-off valve (7); a pressurizing chamber (40) communicatively connected to a pressure-receiving surface (37) of the piston (36); and a communicating passage (42) communicatively connecting a throttle passage (28) of the throttle valve (22) to the pressurizing chamber (40). When a pressure of the compressed air supplied from the first port (P) to the pressurizing chamber (40) through the throttle passage (28) and the communicating passage (42) reaches a set pressure, a valve opening force exerted on the piston (36) exceeds a valve closing force exerted on the on-off valve (7), and thereby the on-off valve (7) is opened. Thus, the compressed air from the first port (P) is supplied to the outside through the second port (A).