1、 Molecular sieve switching valve is accompanied by higher temperature resistance, higher sealing performance and higher process safety. Three eccentric hard sealing butterfly valve and three Xuan valve have been considered since the previously commonly used high-performance butterfly valve. The improvement of valve performance also brings about a significant increase in price. Appropriate measurement of performance price ratio is also what users need to consider in the early stage of the project. The diameter of the valve has also been expanded to 1m or more.

Maintenance of sleeve compensator and introduction to characteristics of compound axial compensator
The main defect of sleeve compensator is hole type. Leakage after welding, and the holes on the weld are generated during welding; The leakage of pickling, assembly and storage, and the holes on the welds are generated during pickling or air tightness and strength inspection. Some holes are caused by corrosion inhibition due to the endless residual acid cleaning of the defective parts. In order to reduce and eliminate these holes, the following aspects must be paid attention to during the welding process:
1. Proper argon maintenance is required. Nitrogen and oxygen in the air are strictly prohibited from mixing into the molten pool to participate in chemical reaction.
2. Affirm reasonable flanging height to prevent incomplete penetration and collapse.
3. The sleeve compensator shall be welded strictly. Select appropriate welding current, welding speed and pulse frequency to match.
4. Unqualified raw materials such as chemical composition segregation, serious inclusions, uneven wall thickness and obvious scratches are not allowed to be welded.
5. The operation workshop shall be kept clean. In the air, no large particles of dust are allowed to move, so as to prevent the SO accounting for 60~77% of the dust from participating in the metallurgical reaction in the welding process.
6. The sleeve compensator shall be strictly stopped from cleaning before welding. In the welding part of the workpiece, no residual moisture in the cleaning medium and moisture in the atmosphere is allowed to prevent the O molecule in the moisture from mixing into the weld metal.
7. Operators shall have complete labor maintenance tools. Dirty hand compensator sleeve, oil sludge cotton yarn, etc. shall not contact the welding part of the workpiece.
principle
The compound axial type compensator is a flexible component composed of two bellows connected with a middle pipe section, a base rigidly connected with the middle section and pipes at both ends. Each bellows is used as a single type ordinary contraction joint to compensate the displacement of each pipe section. The rigid connection between the base and the middle pipe section can accept all forces and moments related to the application site.
characteristic
The compensator mainly applies the common performance of rubber. Such as high elasticity, high air tightness, medium resistance, weather resistance and radiation resistance. It is made of polyester cord fabric with high strength and strong cold and hot stability, which is cross checked and then molded and cross-linked under high pressure and high temperature. It has high internal density, can accept higher pressure, and has excellent elastic deformation effect. The product structure design section arc height, curve length, has a large multi-directional unique function. It is especially suitable for places with complex geological conditions, large settlement amplitude and pipeline damage caused by frequent changes in cold and heat during pipeline operation. The elastic sliding transfer of rubber and the heat transfer and dissipation function of deformation mechanical force can effectively eliminate the displacement physical damage of pumps, valves and pipes. Since rubber is a poor conductive material, it is also an ideal environmental protection product for reducing vibration and noise transmission. The product is designed to lubricate the inner wall. After practical testing, it has no impact on the flow rate and flow of the medium, and it never rusts. It can eliminate the maintenance during the valid exercise period.