Slow start valve
AssigneeCkd Corporation
InventorTetsunobu Tarusawa
Life of this patent
Estimating the term…
Abstract
A slow start valve has a first valve member for opening and blocking a flow passage between an inlet port and an outlet port and a second valve member for opening and blocking a flow passage between the outlet port and an exhaust port, both being integrally formed in a spool without adopting a poppet construction, wherein the actuation of the spool by force of compressed air causes slow supply, quick supply and exhaust. Compressed air supplied via a solenoid three-way valve causes a piston to move downward along with the spool in contact therewith and then compressed air supplied via a passage causes the spool to move further downward, a second valve opening being immediately shut off with the second valve member.
Claims19
A slow start valve comprising:
- a valve body having an inlet port, an outlet port and a secondary pressure exhaust port, and defining a main flow passage between the inlet port and the outlet port;
- a main valve for controlling fluid flow between said inlet, outlet and exhaust ports, slidably disposed within said valve body;
- a bypass flow passage diverging from the main flow passage in said valve body;
- a flow adjusting member disposed in said bypass flow passage;
- and
- a control valve for controlling flow of fluid directed in said bypass flow passage,
- said control valve controlling supply of a slight flow of fluid via the bypass flow passage to the outlet port for a predetermined period from a start of fluid supply via said inlet port to provision of fluid communication through the main flow passage by the main valve,
- wherein said main valve is constructed of a first valve member for controlling opening and blocking of the main flow passage and a second valve member for controlling opening and blocking of the flow passage between the outlet port and the exhaust port, said first and second valve members being formed coaxially and integrally with each other.
Dependencies are inferred from the claim text.