The Hand Sliding Valve is a valve that controls the flow of fluids or gases through hand operation. As a fundamental component in fluid control systems, the hand sliding valve features a simple structure and reliable performance, making it widely used in various industrial fields. It adjusts or stops the flow of fluids by sliding the valve core, offering precise and direct control. The design of the hand sliding valve enables it to operate efficiently in a variety of working environments, particularly excelling in situations where no electricity or automation control is required.
The Hand Sliding Valve is a type of Slide Gate Valve that requires manual operation, typically adjusted by rotating a handle or manual control rod to change the position of the Slide Gate, thereby controlling the fluid flow. Unlike electrically or pneumatically actuated sliding valves in automated control systems, the manual sliding valve relies on operator intervention to adjust.
The Slide Valve (also known as a valve core valve) is a valve that uses the relative movement of the sliding Slide Gate to regulate the fluid passage. By moving the valve core, the size of the valve opening can be changed, thereby controlling the fluid flow, pressure, and direction. Sliding valves are widely used in pneumatic and hydraulic systems.
Valve slide manually controls airflow through a simple and effective mechanism. By moving the sliding plate inside the valve body, users can open, close, or regulate airflow. This makes these valves suitable for various applications, such as cylinders, pneumatic tools, and pipeline flow control. Festo's VBOH manual sliding valve exemplifies a robust and adaptable design, featuring threaded pneumatic connections, a wide working pressure range, and durable materials like anodized forged aluminum alloy and PBT.
The Hand Sliding Valve consists of several key components, and a typical hand slide gate valve includes the inlet, seal, exhaust port, slide plate, body, grip ring, and outlet.
To ensure its proper function and durability, the key components and their specific purposes are as follows:
Inlet and Outlet: The inlet and outlet have threaded connections, one male and one female.
Seal: The seals (such as O-rings) located around the slide plate prevent leakage and ensure a tight seal when the valve is in the closed position, maintaining the system pressure.
Exhaust: The exhaust port is located below the valve body to prevent dust and debris from entering the valve.
Slide Plate: The movable component that slides inside the valve body to open or close the flow path. It is the primary mechanism for controlling compressed air flow.
Valve Body: The main structure that houses all other components. It provides the frame and support for the valve.
Grip Ring: The grip ring is installed on the slide plate, allowing the user to manually move the slide plate to the desired position, thereby adjusting the airflow.
The manual sliding valve works similarly to a regular sliding valve by adjusting the valve core position to change the fluid path. However, unlike automated sliding valves, the operator needs to directly control the valve core's movement by manually operating the control rod or rotating the handle. The typical manual operation steps are as follows:
Opening the Valve: When the grip ring is moved to the open position, the slide plate moves, creating a clear path for compressed air to pass through the valve.
Closing the Valve: By moving the grip ring to the closed position, the slide plate slides back, blocking the flow path and stopping the airflow.
Exhausting: When the manual valve is closed, the outlet is connected to the exhaust port, allowing the air to be expelled from the valve, typically venting to the atmosphere.
Flow Adjustment: By partially opening or closing the valve, the user can regulate the amount of compressed air passing through, enabling precise control of the system.
Sealing: The seals around the slide plate ensure that no air leaks when the valve is closed, maintaining system pressure and efficiency.
| Characteristic | Solenoid Valve | Manual Slide Valve |
|---|---|---|
| Operation Method | Automated or controlled by external signals (electric, pneumatic, etc.) | Manual operation, adjusted via control lever or knob |
| Application Field | Pneumatic, hydraulic automation control systems | Devices and systems requiring manual operation |
| Control Method | Automated control, suitable for automated systems | Relies on operator manual intervention |
| Usage Complexity | Relatively complex, suitable for large-scale automated systems | Relatively simple, suitable for small-scale applications |
| Main Advantages | Efficient, suitable for complex applications | Simple operation, lower cost |
Based on the above, we can see that manual slide valves rely on the operator's manual intervention to adjust, but the complexity of use is simpler compared to general slide valves.
Normally, manual slide valves provide multiple operating modes, such as one-way flow control, two-way flow control, etc. The operator manually adjusts the flow rate, direction, or pressure.
Manual slide valves can be installed in various applications to control the flow of compressed air. Here are some common uses and installations:
Pneumatic Cylinder: Used to control the airflow towards the cylinder, allowing for precise control of its movement. For example, pneumatic single piston slide gate valves
Pneumatic tools: installed to control the airflow of pneumatic tools.
Online flow control: usually installed in pneumatic systems as an on/off mechanism to control air flow.
Pneumatic device: used to separate various parts of the pneumatic device for maintenance or isolation of specific parts.
Compressed air system: installed as a shut-off function for pressurized and exhaust compressed air systems.
Air compressor: usually installed near the air compressor to control the airflow leaving the compressor.
Air pipeline: used to isolate the air pipeline and discharge downstream pressure, ensuring safety and control within the system.
Question: What should I do if the manual slide valve lever or knob does not rotate flexibly and there is a jamming phenomenon?
Firstly, check if there are any foreign objects stuck at the connection between the operating lever or knob and the valve body. If so, clean the foreign objects.
Check the lubrication condition of the operating lever or knob. If the lubrication is insufficient, add an appropriate amount of grease.
Check if there are impurities blocking the inside of the slide valve, which may hinder the movement of the valve core. Disassemble the slide valve for cleaning.
Question: When operating the manual slide valve, I feel a lot of resistance and find it difficult to push or rotate. What is the reason for this?
Perhaps the clearance between the valve core and valve body is too small, causing an increase in friction. The fit clearance between the valve core and valve body can be adjusted appropriately.
The seal of the slide valve is aging or damaged, which increases the frictional resistance and requires replacement of the seal.
The system pressure is too high, causing the slide valve to bear excessive pressure and making operation difficult. The system pressure can be checked and adjusted.
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