Butterfly valve
The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully opened. The butterfly valve has simple structure, small volume, light weight and simple operation. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better performance. flow control characteristics.
Butterfly valve can be divided into soft seal and hard seal according to the material of the sealing surface; according to the connection form, it can be divided into wafer type, flange type and clamp type; according to the driving method, it can be divided into manual, electric and pneumatic.
Gate vavle
The gate valve is used as a cut-off medium. When fully open, the entire flow is straight, and the pressure loss of the medium is minimal at this time. Gate valves are usually suitable for conditions that do not require frequent opening and closing, and keep the gate fully open or fully closed. Not intended for use as regulation or throttling. For high-speed flowing media, the gate can cause vibration of the gate when it is partially opened, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the gate to be eroded by the medium.
The gate valve can be divided into soft seal and hard seal according to the material of the sealing surface; according to the structure, it can be divided into open rod and dark rod; according to the driving method, it can be divided into manual, electric and pneumatic. According to the connection form, it can be divided into flange type, clamp type, welding type and thread type.
Ball vavle
The ball valve is evolved from the plug valve, which is rotated 90 degrees to open and close the valve. The difference is that the plug body is a sphere with a circular through hole or channel passing through its axis. The ratio of the spherical surface to the channel opening should be such that when the ball rotates 90 degrees, all spherical surfaces should appear at the inlet and outlet, thereby truncating the flow. The ball valve can be closed tightly with only a 90-degree rotation operation and a small torque. The completely equal body cavity of the valve body provides a low-resistance, straight-through flow path for the medium. It is generally believed that the ball valve is most suitable for direct opening and closing, but recent developments have designed the ball valve so that it can be used for throttling and flow control.
According to the driving mode, the ball valve can be divided into manual, electric and pneumatic; according to the connection form, it can be divided into flange type, welding type and screw type; according to the structure form, it can be divided into fixed type and floating type.
Shut-off valve
The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable cut-off action. Once the disc of the globe valve is in the open state, the contact between its valve seat and the sealing surface of the disc is no longer, and it has a very reliable performance. Cut-off action, this valve is very suitable for medium cut-off or regulation and throttling.
The globe valve can be divided into manual, electric and pneumatic according to the driving mode; according to the connection form, it can be divided into flange type, welding type and thread type.
Check vavle
The check valve is also called a check valve, commonly known as a one-flow valve, which can be automatically opened according to the pressure difference between the front and the back of the valve. The check valve is mostly used in the water supply pipeline. It has strict directionality during installation and must not be installed in reverse.
Check valves can be divided into flange type, wafer type and screw type according to the connection method; according to the structure form, they can be divided into lift type, swing type and butterfly type.
Due to space reasons, I will introduce you how to distinguish several common valves. If you have any questions, you can click on the website online customer service for consultation.
