SO Series Hydraulic Lock

I. Product Introduction

The bidirectional hydraulic lock belongs to the oil circuit locking class of combined control valves. The valve body is assembled from two pilot-operated check valves, with the core function of locking hydraulic oil circuits and blocking internal oil flow in the circuit. The valve body can be directly mounted on the hydraulic cylinder body to resist external load pressure, long-term fix the working position of the hydraulic cylinder piston rod, avoid cylinder retraction and offset displacement, and is suitable for heavy machinery equipment hydraulic positioning working conditions.

II. Internal Structure of Valve Body

The single pilot-operated check valve has built-in components including: valve seat, sealing steel ball, return spring, pilot port, control plunger, and push rod. The valve body has three standardized oil ports A, B, and X, with clear division of labor, cooperating to complete oil circuit forward conduction, reverse locking, and controllable reversing operations.

III. Oil Circuit Conduction Working Principle

1. A-B forward flow: Hydraulic oil pressure overcomes spring force, pushes open the sealing steel ball, and the medium can flow freely and smoothly;

2. B-A reverse flow: When no external control pressure oil is supplied, the spring pushes the steel ball against the valve seat for sealing, the oil circuit is locked, the medium cannot flow in reverse, and the cylinder position is locked;

3. Reverse controllable conduction: The X pilot port is connected to pressurized control oil, the oil pressure acts on the control plunger to push the plunger forward, and the linked push rod pushes open the sealing steel ball, realizing reverse flow of the medium B-A and releasing the oil circuit locking state.

IV. Core Product Features

1. Integrated combined structure, dual pilot-operated check valves linked for locking, bidirectional locking of hydraulic cylinder dual-side oil circuits, strong positioning stability;

2. Steel ball cone surface sealing structure closes tightly, oil circuit internal leakage is small, can maintain piston rod position constant for a long time;

3. Three-port standardized layout, oil circuit logic is clear, forward oil passage, reverse self-locking, and pressure-controlled unlocking are easy to operate;

4. Can be directly mounted on the hydraulic cylinder outer wall, integrated installation is convenient, no need for additional bypass locking oil circuit, saving assembly space;

5. Strong pressure adaptation, can withstand equipment external lateral and downward loads, not prone to pressure relief and cylinder drop problems;

6. Internal components are durable and wear-resistant, medium adaptation is wide, suitable for conventional hydraulic oil media, suitable for heavy machinery high-frequency working conditions.

V. Application Scope

Suitable for lifting machinery, mining machinery and various general mechanical equipment hydraulic systems, mostly directly installed with matching hydraulic cylinders, locking piston rod telescopic positions, ensuring equipment outriggers, lifting arms, tooling fixtures and other components maintain fixed positions during load-bearing operations.

VI. Usage Precautions

1. Valve body installation should fit the hydraulic cylinder standard oil port, with flat sealing interface, to avoid oil leakage at the interface under high-pressure conditions;

2. Distinguish between working oil ports and X pilot port, match the system rated control oil pressure, oil pressure must meet the standard for smooth unlocking and reversing;

3. Keep hydraulic medium clean, install oil circuit filter accessories, hard impurities will hit the steel ball and valve seat, damaging sealing accuracy;

4. Under load-bearing working conditions, ensure synchronous locking of dual-side check valves to avoid component offset caused by unilateral oil circuit pressure relief;

5. Regularly verify spring elasticity and steel ball sealing surface integrity, replace worn parts in time to maintain long-term pressure-keeping locking effect;

6. Control system oil temperature and oil pressure, avoid over-condition operation, slow down sealing part aging, and extend valve body service life.