Imperial Clevite Inc.

Shaukat A Kazi

Abel E Kolchinsky

A hydraulic solenoid valve having a self-contained spool positioning spring and washer solenoid tube assembly. The valve body is provided with a novel arrangement of ports providing for minimized pressure differential between the opposite ends of the valve chamber so as to facilitate positioning of the spool and permit utilization of a light biasing spring and high force solenoids. The port configuration permits minimizing the overall height of the valve body while yet providing for a relatively large cross section tank port, providing the desirable low pressure differential between the opposite ends of the valve chamber. The biasing assemblies further provide for reduced effect of the pressure differential on the spool valve end shafts, thereby further facilitating repositioning of the spool in the neutral position by the biasing springs. Any one of a plurality of different strength springs may be utilized in the biasing assembly, wherein the springs are removably retained by a removable lock ring cooperating with the washer which serves as a spring retainer at one end of the spring.

Hydraulic solenoid valve structure

A valve structure (10) wherein a main valve (11) is controlled by a pilot valve (15) which is normally selectively positioned by the coaction of a solenoid coil (17) and plunger (16). A manual override structure (22) is provided for selectively permitting normal control of the pilot valve by the solenoid, or causing a fast repositioning of the plunger against the action of the normal biasing spring 50 thereof.

Cartridge solenoid valve with manual override

A cartridge solenoid poppet valve (10) arranged to use a single size pilot valve (31) with any one of a set of a plurality of different size sets of valve seat members (14) and poppet valves (24). Pilot guides (175) are provided having different transverse extents to accommodate such different size valve members. The valve further includes a flatted pilot guide (32) defining flow passages communicated between a transfer chamber (35) and a pilot valve chamber (30) in which the pilot valve (31) is disposed. A T-slot (58) is provided in the solenoid plunger (38) extending fully diametrically thereacross and the pilot valve includes a T-shaped connecting head (71) received therein. The plunger (38) and plug (41) define cooperating stop surfaces (67,70) for maintaining a small spacing between the plunger and plug at all times. Solenoid structure (53) includes a parallelepiped frame (46) defining a space with the solenoid coil (44) received therein. The portion of the coil space not occupied by the coil is filled with a set synthetic resin. The structure includes a nut (52) threaded to a connecting portion (79) of a plug (41) to bear forcibly against a flange (51) on a washer (50) urging the washer axially outwardly against the solenoid frame (46) and thereby urging the frame outwardly against an adapter (11) arranged to be threaded to a port (73). The outer housing (49) is a configuration generally similar to the external configuration of the frame.

Solenoid valve

A cartridge solenoid poppet valve (10) arranged to use a single size pilot valve (31) with any one of a set of a plurality of different size sets of valve seat members (14) and poppet valves (24). Pilot guides (175) are provided having different transverse extents to accommodate such different size valve members. The valve further includes a flatted pilot guide (32) defining flow passages communicated between a transfer chamber (35) and a pilot valve chamber (30) in which the pilot valve (31) is disposed. A T-slot (58) is provided in the solenoid plunger (38) extending fully diametrically thereacross and the pilot valve includes a T-shaped connecting head (71) received therein. The plunger (38) and plug (41) define cooperating stop surfaces (67,70) for maintaining a small spacing between the plunger and plug at all times.

Growing community of inventors

Chicago, IL, United States of America

Shaukat A Kazi