YF Type Relief Valve 1

I. Product Introduction

The YF Type Relief Valve adopts a balanced piston structure with a manual pressure adjustment mechanism. The valve body operates stably with high pressure adaptability and low noise. The relief valve is an indispensable core control element in hydraulic systems, mainly used to stabilize the working pressure of the hydraulic system, maintain constant system pressure, and prevent system pressure overload, serving as a safety relief protection for the system and ensuring the smooth and safe operation of the entire hydraulic equipment.

II. Operating Parameters

1. Nominal working pressure: ≤31.5MPa;

2. Ambient temperature range: -20℃~+65℃;

3. Suitable working media: No. 20 hydraulic oil, No. 30 hydraulic oil and other conventional hydraulic media;

4. Standard oil temperature: 50℃±5℃;

5. Medium kinematic viscosity: 17~32 cSt;

6. Oil circuit filtration standard: System oil circuit filtration accuracy shall not be less than 30 microns to avoid impurity wear on the valve core structure.

III. Valve Body Installation Adjustable Angles

To adapt to on-site pipeline layout and optimize operational convenience, the valve body connection end can be installed at multiple angles for directional change, adapting to various pipeline connection scenarios:

1. Threaded and flanged models: The valve cover can be installed at any of four 90° orientations;

2. Plate-mounted model: The valve cover can be installed at any of three 90° orientations.

IV. Pressure Adjustment Method

The valve body top is equipped with a pressure adjustment handwheel. Manually rotating the handwheel changes the pressure setting value inside the valve body, making pressure adjustment intuitive and simple: clockwise rotation of the handwheel increases the system set pressure; counterclockwise rotation decreases the system set pressure, allowing precise matching of the hydraulic system working pressure as needed.

V. Remote Control Usage

To achieve remote oil circuit control, high/low multi-stage pressure regulation, and system unloading operations, unscrew the original M18×1.5 plug at the valve body remote control port and connect the external control oil circuit to switch to external control mode, expanding the valve multi-stage pressure regulation and remote unloading functions.

VI. Standard Oil Port Definitions

The valve body features a standardized three-port design with fixed port functions. The oil circuit connections must not be reversed:

1. Port P: Oil inlet port;

Port O: Oil overflow port;

Port K: External remote control port.

VII. Core Product Features

1. Balanced piston valve body structure with good pressure balance, low high-pressure operation noise, and stable working conditions;

2. Manual handwheel pressure adjustment with clear pressure increase/decrease logic, stable linear pressure regulation, and convenient debugging;

3. Multi-angle installation adaptability, all three connection types allow directional installation, suitable for complex pipeline layouts;

4. Built-in external control port with strong expandability, enabling remote pressure control, multi-stage pressure regulation, and system unloading;

5. Dual-function pressure stabilization and overload protection, maintaining constant system oil pressure while providing overpressure relief to protect hydraulic pumps and pipeline components;

6. Clear working condition parameters with specified media, temperature, and filtration requirements, suitable for conventional industrial hydraulic systems.

VIII. Application Scope

Widely used in machine tool hydraulic stations, construction machinery hydraulic systems, energy storage hydraulic oil circuits, and industrial complete hydraulic equipment, for system pressure stabilization, overpressure safety relief, and oil circuit unloading, suitable for medium-to-high pressure fixed hydraulic control systems for long-term use.

IX. Usage Precautions

1. System operating pressure shall not exceed the 31.5MPa rated pressure value to prevent piston structure overload damage and leakage;

2. Strictly control hydraulic oil viscosity and oil temperature indicators, regularly test oil circuit filtration accuracy, and replace filter elements promptly when impurities exceed standards;

3. Verify oil port identification during installation, distinguish inlet, overflow, and external control ports, and never connect oil circuits incorrectly;

4. When installing the valve cover with directional change, evenly tighten connecting bolts to avoid seal displacement and oil leakage at the joint surface;

5. Rotate the handwheel at a uniform speed; do not apply force quickly to avoid sudden oil pressure changes impacting downstream hydraulic components;

6. When remote control is not needed, ensure the M18×1.5 remote control port plug is tightened to guarantee external control port sealing without oil leakage;

7. For long-term pressure stabilization use, regularly verify pressure adjustment accuracy and promptly maintain internal piston and sealing components.