Threaded cartridge type manual proportional reversing valve

Abstract

A threaded cartridge type manual proportional reversing valve comprises a handle, a transmission shaft, a limiting device and a locking device, wherein the handle is connected to and fixed on the transmission shaft through a cap, the limiting device is composed of an upper limiting part, a lower limiting part and a protecting jacket, a groove formed by the upper limiting part and the lower limiting part is matched with the protruded part of a transmission rod, the locking device comprises a spring, a locking valve element, a seal seat and a valve head assembly, a nut is fixed on the valve head assembly and connected with a rotary knob through a thread, and the rotary knob is in threaded connection with the locking valve element and is fixed through a holding pin. Compared with the prior art, according to the threaded cartridge type manual proportional reversing valve, the limiting device is additionally arranged, and the maximum flow can be effectively controlled; the locking device is improved, misoperation can be effectively prevented, and therefore injury accidents of maintenance personnel are effectively prevented.

Description

technical field

[0001] The invention relates to a hydraulic control actuator, in particular to a threaded cartridge type manual proportional reversing valve. Background technique

[0002] Manual reversing valve is a reversing valve that controls the flow port by hand. It is characterized in that it does not need a power control part, and is suitable for work occasions where the reversing is manually controlled. However, the positioning of the usual manual reversing valve is achieved by springs and steel balls. It is characterized by poor positioning reliability. When the handle encounters an unexpected external force, it will change direction, causing the valve to malfunction, resulting in safety problems. .

[0003] Patent No. 201420031247.5 discloses a manual reversing valve with a self-locking device. By hinged the hand shaft and the hinge shaft, and setting a positioning block, the hand rod rotates through the hinge shaft and snaps into the positioning slot of th...

Images