What Is The Difference Between A Gate Valve And A Flow Valve?

There are significant differences between gate valves and flow valves in many aspects. The following is a detailed comparison of the two.

1. Construction principle
Gate valve
The opening and closing parts (gate) of the gate valve are driven by the valve stem and move up and down linearly along the valve seat (sealing surface). The structure of the gate valve is relatively simple, mainly composed of a valve body, a valve (gate), a transmission mechanism and a sealing system.
The gate valve fills the medium gap in the valve body by raising or lowering the valve, thereby opening and closing the fluid medium. When fully open, the gate is parallel to the valve seat channel, and the water flows straight through with little resistance.
Flow valve
The flow valve is a multi-position angular stroke valve that can control the flow of fluid media. It changes the flow of the medium by adjusting the size of the flow channel.
The flow valve is usually composed of a valve, a valve seat, a valve disc, a drive device, a sensor and a control circuit. During operation, the valve adjusts the size of the flow channel between the valve seat and the valve disc through an electromagnet and a drive device, thereby achieving precise regulation of the medium flow.
2. Control method
Gate valve
Gate valves are mainly opened and closed by manual or electric control. The control effect is usually achieved through manual judgment and adjustment, with relatively large errors and low control accuracy.
Flow valve
The flow control of the flow valve is generally achieved through PID closed-loop control, and can also be programmably controlled through control devices such as PLC. Under different control methods, the flow valve can achieve different control effects and has high control accuracy.
3. Applicable scenarios
Gate valve
Gate valves are mainly suitable for occasions where the flow of pipeline media needs to be cut off, such as irrigation, industrial water, gas, oil pipelines, etc. Gate valves are usually used in working conditions where frequent opening and closing are not required and the gate is kept fully open or fully closed.
Gate valves are not suitable for use as regulation or throttling, because when fully open, the water flows straight through with low resistance, but throttling will cause the gate to be eroded by the medium.
Flow valve
Flow valves are suitable for occasions with high flow requirements, low medium viscosity, and low pressure drop requirements, such as flow measurement, regulation, control and other fields. It is particularly suitable for water systems that require flow control, such as flow control of non-corrosive liquid media such as heating and air conditioning.
4. Performance characteristics
Gate valve
Gate valves have relatively low cost, simple structure, and are easy to install and maintain.
However, due to the low control accuracy of gate valves, the adjustment accuracy is relatively poor, especially when the viscosity and temperature of the medium change greatly, the control effect will be greatly affected.
Flow valve
Flow valves have the advantages of high precision, wide flow adjustment range, and high control accuracy.
But the price is high, it is inconvenient to move, and professional maintenance is required.
There are significant differences between gate valves and flow valves in terms of construction principles, control methods, applicable scenarios, and performance characteristics. When choosing, comprehensive consideration should be made based on the specific use environment and needs to ensure that the appropriate valve type is selected.