LDF Type Throttle Valve

I. Product Overview

Throttle valves and one-way throttle valves are both simple flow control valves that regulate medium flow through internal flow cross-section, controlling hydraulic actuator running speed, suitable for constant displacement pump hydraulic system speed control. The valve body structure is simple and assembly is convenient, suitable for conventional low-speed hydraulic oil circuits with small working condition fluctuations. In the industry, draw valves can control fluid flow rate by changing flow cross-section and channel length, and when combined with check valves in parallel, they form one-way throttle valves.

II. Throttle Valve Applications and Characteristics

Throttle valves regulate oil circuit flow by changing internal flow cross-section size, controlling the running speed of actuators such as cylinders and motors. The valve body structure is simple, and the pressure difference before and after the valve body changes with load variations, thereby affecting the stability of actuator running speed, suitable for hydraulic systems with small load fluctuations and low speed control accuracy requirements. The valve inlet and outlet ports support interchangeable connection, providing stronger pipeline installation adaptability.

III. One-way Throttle Valve Structure and Principle

One-way throttle valves are composed of a check valve and throttle valve in parallel combination, with differentiated bidirectional flow logic: when oil flows forward, the medium passes through the throttle valve, with controllable flow regulation to control the actuator forward running speed; when oil flows in reverse, the built-in check valve opens automatically, and oil flows directly and quickly through the check valve without throttle speed control limitation, thereby achieving differentiated bidirectional running speeds for the actuator.

IV. System Speed Control Adaptation Forms

In constant displacement pump hydraulic systems, throttle valves work with relief valves to build three types of throttle speed control oil circuit systems: inlet circuit throttle speed control system, return circuit throttle speed control system, and bypass throttle speed control system, suitable for different oil circuit pressure stabilization and speed control conditions.

V. Working Condition Adaptation Limitations

Throttle valves have no flow negative feedback structure, cannot offset flow rate deviations caused by load fluctuations, and cannot guarantee constant speed under load variation conditions, suitable for hydraulic scenarios with gentle load changes and low speed stability requirements.

VI. Core Product Features

1. Simple valve body structure, low processing cost, convenient disassembly and maintenance, suitable for conventional small and medium hydraulic oil circuits;

2. Basic throttle valve inlet and outlet ports can be swapped, no hard flow direction restriction, high pipeline layout flexibility;

3. Flexible combination forms, draw valve combined with check valve in parallel can be assembled as one-way throttle valve;

4. Bidirectional speed control differentiation, one-way throttle valve with forward throttle speed control and reverse direct fast oil return;

5. Suitable for constant displacement pump speed control, three types of speed control circuits available, suitable for fixed hydraulic unit speed control;

6. No flow compensation function, suitable for stable load conditions, not suitable for heavy-duty alternating load oil circuits.

VII. Application Range

Suitable for machine tool auxiliary hydraulic systems, small tooling hydraulic oil circuits, light construction machinery hydraulic circuits, and fixed hydraulic stations with constant displacement pumps, for actuator low-speed speed control and fast-slow speed reversal control, suitable for hydraulic speed control scenarios with small load fluctuations and general speed control accuracy requirements.

VIII. Usage Precautions

1. For high-precision pressure stabilization speed control conditions, throttle-type flow valves should not be selected; flow feedback control valves are required;

2. Verify oil circuit flow direction during installation; one-way throttle valves must distinguish throttle direction from direct-flow direction to avoid reverse installation failure;

3. Adjust throttle opening uniformly, avoid sudden opening changes to prevent oil pressure shock damage to downstream hydraulic components;

4. Install filter accessories in oil circuit to isolate impurities from jamming throttle port, avoiding unstable flow control and flow rate fluctuations;

5. When interchanging throttle valve port installation, re-verify speed control flow to meet equipment operation speed requirements;

6. When speed control with relief valve, set relief pressure as needed to ensure coordinated oil circuit speed control and pressure stabilization;

7. Regularly clean throttle port oil sludge accumulation during long-term use to prevent flow area changes affecting speed control accuracy.