Pneumatic ceramic double gate valve
Technical Parameters
Product model: Z644TCNominal diameter: DN40-350mm
Nominal pressure: 1.0-1.6MPa
Working pressure of pneumatic actuator: 0.4~0.6MPa
Applicable temperature: ≤ 200 ℃ (also available in high-temperature resistant * * high temperature resistant to 400 ℃)
Applicable media: fly ash, dry powder dust, gas, water, etc
Scope of application: Fossil fuel power station dry ash system, silo pump discharge and transportation. Bulk material conveying systems in industries such as chemical, metallurgical, papermaking, pharmaceutical, etc.
Product Overview
Pneumatic ceramic double gate valve, also known as pneumatic ceramic parallel double gate valve or dry ash valve, is a type of ceramic gate valve. Therefore, its structure and working principle are consistent with ceramic gate valves. Its opening and closing body (valve plate) is driven by the valve stem to lift the sealing surface of the valve seat, which can connect or cut off the passage of fluid. When the valve is partially opened, eddy currents are generated on the back of the gate, which can easily cause erosion and vibration of the gate, damage the sealing surface of the valve seat, and make repair difficult. It is usually suitable for working conditions that do not require frequent opening and closing, and maintain the gate fully open or fully closed. By setting the ceramic track strip on the inner side of the valve cover and the boost spring inside the three-way valve core, the left and right gate plates can effectively move tightly against the ceramic track strip without any leakage, thereby ensuring the normal operation of the valve body. The utility model has a simple structure and is easy to install and use.
The ceramic double gate valve is mainly used in the feeding, discharging, and conveying pipelines of dry powder materials, as a cut-off and connecting medium channel. It is also used as a discharge valve, balance valve, exhaust valve, and blockage removal valve for the warehouse pump, as well as a pipeline switching valve and an ash discharge valve for the ash silo. It has the characteristics of good sealing performance, low starting load, less ash jamming and accumulation, strong wear resistance, and long service life. Ceramic double gate valves usually use flange connection, which can be divided into two driving methods: manual and electric. Specifically, the scope of use of this series of products is: 1. Power plant ash removal - dry ash removal system; 2. Mineral processing plant - selection and transportation of dry ore powder materials; 3. Cement industry - conveying and discharging of dry powder materials; 4. Gristmill - flour conveying pipeline. 5. For the transportation of high wear media such as other powders or small solid particles, as these industrial and mining media often contain hard particles and fibrous dirt, this valve can play an excellent role as an opening and closing device in pipeline systems.
Product Features
1. This valve has advanced design concepts and unparalleled characteristics compared to ordinary valves. As a fluid control system, it effectively solves the long-standing problem of leakage caused by damage to the sealing surface of the gate valve caused by debris.
2. This valve adopts a spring self sealing structure and a special type of sealing surface, which ensures that the sealing pair always matches at any position and can completely scrape off residual dirt (such as sediment, welding slag, and other attachments) adhering to the sealing surface. The sealing surface is not damaged in any way. Due to the high hardness and corrosion-resistant alloy material deposited on the sealing surface, it has been proven by many manufacturers that this structure not only can scrape off all kinds of dirt on the sealing surface, but also can ф The 5mm stainless steel welding rod is cut off without any damage to the sealing surface, and it works normally.
3. Due to the spring self sealing structure in the valve, it can automatically compensate for the normal wear and tear of the sealing surface. On the one hand, due to its strong sealing performance, the leakage rate is zero, and on the other hand, it greatly improves the working life of the valve, saving costs for the enterprise.
4. The valve adopts a wedge type roller switch mechanism, which can easily open and close the valve and provide a warning device for minor leakage on the sealing surface. If there is a small leakage in the valve, simply closing the handwheel can keep the valve at zero leakage, which is a skill that ordinary valves do not possess.
5. Due to the use of a special switch mechanism, the phenomenon of ordinary gates being stuck and unable to open due to significant temperature changes has been prevented.
6. The valve is equipped with an automatic drainage system at the bottom, which always keeps the valve body cavity clean and free of residue.
7. The valve body is equipped with a dustproof mechanism to ensure that there is no dirt entering the valve chamber, which may cause the internal mechanism to malfunction
Structural characteristics
1. The valve plate and valve seat are made of toughened engineering ceramics, with excellent erosion resistance and wear resistance;
2. There is a spring installed between the two gate plates to achieve self tightening sealing with bidirectional flexible pre tightening pressure of the spring, which has the performance of low-pressure bidirectional sealing and no jamming or dust accumulation during the opening and closing process;
During the valve opening and closing process, the valve plate rotates and the valve seat is evenly worn in, ensuring long-lasting and durable sealing performance;
4. The sealing surface in the dry powder medium wears evenly during frequent opening and closing processes, with high sealing performance and long service life;
5. The valve body adopts an eccentric design for the channel, which generates material eddy currents when the valve plate is opened to discharge materials. The material eddy currents will clean up the stuck materials in the valve body cavity. Additionally, a soot blowing port is designed to facilitate the use of an external air source to assist in removing dust accumulation inside the valve and during valve maintenance.
operational principle
The working principle of ceramic parallel double gate valve: With the external power provided by the cylinder or handwheel, the valve stem drives the valve plate to move up and down to achieve the opening and closing of the valve. During the opening and closing process of the valve, the pre tightening force of the spring set between the double gate plates is used to ensure close contact between the valve plate and the valve seat, achieving sealing. The working principle of the pneumatic ceramic double gate valve is that when the air source is introduced from the upper intake port, the valve stem drives the valve plate to move downwards, and the valve closes. When the air source enters from the lower air inlet, the valve stem drives the valve plate to move upwards and the valve opens. A spring is loaded between the valve plate and the valve seat. The spring force always makes the valve plate press against the valve seat to ensure the tightness of the valve, and allows the valve plate to move vertically up and down, which helps to compensate for the Thermal expansion of valve parts, overcome the impact of any back pressure change on the seal and prevent particle media from entering between the two sealing surfaces. During the opening and closing process, the valve plate can generate self rotation, causing grinding and polishing effects between the sealing surfaces. Moreover, due to the eccentricity of the valve body towards the channel, vortex will be generated when opening and discharging materials, and the material vortex formed will self clean the valve chamber. All of these characteristics make this valve have a longer service life.
