1 Overview
Pneumatic ceramic double gate valve is also known as ceramic parallel double gate valve or ceramic dry ash valve, the opening and closing parts (ceramic gate) are driven by the valve stem for lifting movement, ceramic double gate valve is driven by the cylinder or hand wheel, and the valve stem drives the valve plate to move up and down to realize the valve opening and closing. In the process of opening and closing the valve, the pretension force of the built-in spring between the double gate makes the ceramic gate and the ceramic seat achieve a reliable sealing pressure.

2 Product Features
2.1 Ceramic double gate valve, also known as ceramic parallel double gate valve or ceramic dry ash valve, the opening and closing parts (ceramic gate) are driven by the valve stem for lifting movement, ceramic double gate valve is driven by the cylinder or hand wheel, and the valve stem drives the valve plate to move up and down to realize the opening and closing of the valve. In the process of opening and closing the valve, the pretension force of the built-in spring between the double gate makes the ceramic gate and the ceramic seat achieve a reliable sealing pressure.
2.2 When opening and discharging materials, eddy currents will be generated, which will clean the inner cavity of the valve by itself, so as to effectively avoid the occurrence of internal accumulation and blockage of the valve.

3 Working Principle
Parallel double gate valve is a kind of ceramic gate valve. Therefore, its structure and working principle are consistent with the gate valve, and its opening and closing body (valve plate) is driven by the valve stem to the sealing surface of the valve seat for lifting movement, which can be connected or cut off the fluid channel. When the valve is partially opened, eddy current is generated on the back of the gate, which is easy to cause erosion and vibration of the gate, and it is also easy to damage the sealing surface of the seat, which is difficult to repair. It is usually suitable for working conditions that do not require frequent opening and closing, and keep the gate fully open or fully closed.
The working principle of parallel double gate valve: with the external power provided by the cylinder or hand wheel, the valve stem drives the valve plate to move up and down to realize the valve opening and closing. During the valve opening and closing process, the valve plate and the seat are closely connected to achieve seal.

4 Scope of Use
4.1 Power plant ash removal - dry ash removal system (pneumatic ash removal system);
4.2 Ore preparation plant/coal preparation plant - conveying of dry ore pulverized coal slag and other materials;
4.3 Cement industry - cement powder conveying and discharging;
4.4 Flour Mill - flour conveying pipeline.
4.5 Pneumatic conveying, feeding and discharging of other high-wear and high-scouring media such as powder or tiny solid particles.

5 Ceramic double gate valve structure features
5.1 The gate and seat are made of high-performance toughened engineering ceramics, with excellent erosion resistance and wear resistance;
5.2 There is a spring built in between the ram, and the bidirectional flexible pretightening pressure of the spring is used to achieve self-tightening seal, with low pressure bidirectional seal, and there is no jam and ash accumulation in the opening and closing process;
5.3 In the process of opening and closing the valve, the ceramic gate rotates and the ceramic seat is evenly ground, which greatly reduces the wear and improves the service life of the product;
5.4 The valve body adopts eccentric design for the channel. Material vortex will be generated when the valve plate is opened to discharge the material, and the material vortex will clean the plug material in the valve body cavity. The valve body is provided with a purge port to facilitate the removal of ash in the valve through an external air source during the maintenance of the valve.

6 Main technical parameters

7 Common faults and troubleshooting methods