Priority flow control valve
AssigneeShimadzu Corporation
InventorShogo Sonokawa
Life of this patent
Estimating the term…
Abstract
A throttle check valve includes: a poppet valve body that has an orifice formed at one end and has a hole portion formed at a side portion; a plug that has a tubular shape to surround the poppet valve body, and functions as a valve seat to come into contact with the poppet valve body; and a spring that biases the poppet valve body and the plug functioning as the valve seat in directions to come into contact with each other. When the spool is at the second position, the plug forming the distal end portion of the spool and the plug arranged in the housing come into contact with each other. The plug is provided with a protruding portion that comes into contact with the poppet valve body.
Claims6
A priority flow control valve comprising:
- a housing in which a high pressure port, a steering port, and a loading/unloading port are formed;
- a spool for guiding hydraulic fluid, supplied from the high pressure port, to the steering port and the loading/unloading port, the spool being configured to be slidable in the housing;
- and
- a spring that biases the spool from a first position at which the hydraulic fluid is guided from the high pressure port to the steering port and the loading/unloading port to a second position at which the hydraulic fluid is guided from the high pressure port to the steering port, wherein
- with the priority flow control valve, the hydraulic fluid, supplied from the high pressure port, is supplied to the steering port with a higher priority, and an excess amount of the hydraulic fluid is supplied to the loading/unloading port, the priority flow control valve further comprising:
- a damper chamber formed in the housing;
- a throttle check valve with which a flow path for the hydraulic fluid from the steering port to the damper chamber is throttled, the throttle check valve being provided between the steering port and the damper chamber, the throttle check valve opening a flow path for the hydraulic fluid from the damper chamber to the steering port;
- and
- an opening member that establishes an opened state of the throttle check valve when the spool is at the second position.
Dependencies are inferred from the claim text.