Electro-hydraulic pressure regulating valve

Fluid handling – Systems – Multi-way valve unit

Patent

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Details

1374545, 137544, 13762564, F15B 13043

Patent

active

046762736

ABSTRACT:
An electro-hydraulic pressure regulating valve including a tubular valve body, a partition in the valve body dividing the latter into a valve chamber and a solenoid chamber, a valve sleeve in the valve chamber with a piston slidable in the sleeve and defining a bias pressure chamber between the piston and the partition and a control pressure chamber on the opposite side of the piston, closed center regulating ports on the piston and the valve sleeve for regulating a supply pressure to a control pressure in the control pressure chamber, a bias pressure orifice between a supply pressure port and the bias pressure chamber, a fluid strainer between the supply pressure port and the bias pressure orifice, a relief orifice in the partition between the bias pressure chamber and a fluid sump, and a solenoid operated valve normally closing the relief orifice and operative when energized to open the relief orifice. The valve is suited for miniaturization and regulates control pressure as a function of bias pressure without exhausting significant quantities of supply pressure directly to the sump.

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patent: 4590968 (1986-05-01), Wolfges

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