Valve unit

Details Valve unit Valve unit

1986-10-16

1988-01-05

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91446, 91447, 137596, 13759613, F15B 1302

Patent

active

047169338

ABSTRACT:
A valve unit for use in a load sensing system having a fluid operated cylinder. The valve unit permits positioning of an implement between the raise, lower, neutral and float positions and also provides for throttling of fluid flow to the cylinders as well as priority flow to the system. Float is obtained through a lock check valve which includes a main poppet maintained in a seated position by a spring biased pilot poppet. A pilot piston is positioned coaxially opposite the main poppet and is responsive to fluid pressure in the valve to act upon the pilot poppet and unseat the main poppet. In the float position, the fluid pressure within the valve may be stand-by pressure which acts upon the pilot piston to allow it gradual decent of the implement. The pilot pressure is communicated to the pilot piston through a centrally located passage. The location of the passage permits additional lock check valves to be easily added as needed. An adjustable priority flow control valve is included in the valve body for manual adjustment of the priority in the system and the flow rate of fluid.

REFERENCES:
patent: 3602243 (1971-08-01), Holt et al.
patent: 4011891 (1977-03-01), Knutson et al.
patent: 4290447 (1981-09-01), Knutson
patent: 4434966 (1984-03-01), Zajac
patent: 4555976 (1985-12-01), Wolfges
patent: 4569273 (1986-02-01), Anderson et al.
Kishor Patel, "Pressure Compensated Electro-Hydraulic Proportional Flow Control Valve", Sep. 1978, SAE Technical Paper No. 780747.
Dynex/Rivett Inc., Bulletin VP 0478, "Proportional Control Valves".

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