Instrument valves are control devices for fluid pipelines, whose basic function is to connect or cut off the flow of medium in the pipeline, change the flow direction of the medium, adjust the pressure and flow rate of the medium, and protect the normal operation of equipment in the pipeline.The widespread application of industrial instrument valves dates back to Watt's invention of the steam engine. In the past two to three decades, higher requirements have been placed on instrument valves due to the needs of petroleum, chemical, power plant, metallurgy, shipbuilding, nuclear energy, aerospace, and other fields. This has prompted people to research and produce high parameter valves, from carbon steel to titanium and titanium alloys, high-strength corrosion-resistant steel, etc. The driving methods of instrument valves have evolved from manual to electric, pneumatic, hydraulic, programmable, numerical control, remote control, etc.With the continuous development of modern industry, the demand for instrument valves is constantly increasing. A modern petrochemical plant requires tens of thousands of various types of valves, and the use of instrument valves is very large. Instrument valves are widely used in various industrial fields, almost involving various areas of industrial production. In these fields, the role of instrument valves is crucial. It can not only control the flow and pressure of fluid media, but also ensure the safe operation of production equipment, effectively reduce production costs, and improve production efficiency.In summary, instrument valves play an irreplaceable role in the industrial field. Each industry needs to choose suitable instrument valves according to different production needs to ensure the normal operation of production equipment, improve production efficiency, reduce costs, and ensure the safety of industrial production.

1. Three valve groups are commonly used for lubrication and sealing of various faucets, water meters, valves (ceramic water valves and three valve groups), sanitary equipment, and diving products.2. The three valve combination is suitable for plastic and rubber components such as toys and appliances, as well as "O" - shaped sealing rings, etc., and can provide long-term lubrication and waterproof sealing effects.3. The three valve combination is suitable for insulation of motors and electronic products, sealing of semiconductors, waterproofing, anti conductivity, anti flash pollution of electrical insulators, high-voltage electronic connection systems and electrical equipment, preventing moisture from entering, preventing corona discharge, eliminating arcs, and can also be used for release, waterproofing, damping, shock resistance, oxidation resistance, etc.4. Three valve combination is used for sealing and lubrication between plastics, plastics and metals, and metals.

A one-way valve is an important hydraulic component that only allows fluid to flow in one direction and blocks fluid in the other direction. The structure of one-way valve is simple, easy to install and use, so it is widely used in engineering. When the one-way valve fails, it will cause the system to malfunction.Common faults of one-way valves:一、 Serious leakage inside the one-way valveReason for malfunction:1. The coaxiality between the valve seat hole and the valve core hole is poor, and the contact surface after the valve core is guided is uneven, with some gaps.2. When the valve seat is pressed into the valve body hole, it may cause tilting or pulling damage.3. The valve seat is shattered.4. The spring becomes soft.5. Slide valve frayed.6. During assembly, if the cleaning is not done thoroughly or if the oil is not used thoroughly, dirt may accumulate or stick between the valve core and the valve seat surface, causing the cone surface of the valve core to not fit tightly with the cone surface of the valve body, resulting in internal leakage.Resolvent:1. Should be re hinged, reworked, or the valve seat should be disassembled, re pressed, and reassembled.2. The valve seat should be disassembled, re pressed and reassembled, or re hinged and reworked.3. The valve seat should be replaced and developed.4. The spring should be replaced.5. Should be redeveloped.6. Should be rechecked, developed, cleaned, and replaced with clean hydraulic oil.二、 Leakage outside the one-way valveReason for malfunction:1. The threaded connection of the tubular one-way valve may experience leakage due to poor thread fit or loose threaded joints.2. The outer part of the plate valve is mainly due to sealing problems at the installation surface and threaded plug.3. The valve body has air holes and sand holes, which are caused by external leakage due to pressure oil breakdown.Resolvent:1. The joint should be checked and tightened, and sealed with polytetrafluoroethylene tape or O-ring between the threads.2. Check whether the O-ring seal on the installation surface and threaded plug is reliable, and eliminate it according to the situation.3. Generally, it is necessary to repair welding or replace the valve body.三、 The one-way valve does not have a one-way functionReason for malfunction:1. The slide valve is biting inside the valve body.2. Missing or broken springs.Resolvent:1. Careful inspection should be carried out, such as when the valve body hole is deformed, when there are burrs at the joint of the slide valve, when the slide valve is deformed and swollen, etc., which will cause the slide valve to bite inside the valve body and cannot move. At this time, the valve seat hole should be repaired, burrs should be removed, and the outer diameter of the slide valve should be repaired.2. Springs should be installed or replaced.四、 The one-way valve makes an abnormal soundReason for malfunction:1. The flow rate of hydraulic oil exceeds the allowable value.2. Resonance with other valves.3. In the pressure relief check valve, there is no pressure relief device for circuits such as vertical large oil cylinders.Resolvent:1. The one-way valve with high flow should be replaced.2. You can slightly change the rated pressure of the valve or try adjusting the strength of the spring.3. The pressure relief device circuit should be supplemented.How to avoid one-way valve failure:Regularly inspect and replace the sealing ring and spring of the one-way valve.Use filters to reduce the entry of pollutants.Prevent excessive or insufficient pressure.

1. The card sleeve high-temperature ball valve has low fluid resistance, easy operation, rapid opening and closing, good sealing and reliability, and can be used in the petrochemical, long-distance pipeline and urban heating industries. Widely used.2. The material of the card sleeve high-temperature ball valve seat is made of polytetrafluoroethylene (or filled with polytetrafluoroethylene), called a soft seal ball valve, and its working temperature does not exceed 200 ° C.3. The material of the valve seat is metal, known as a hard seal ball valve or high-temperature ball valve, with a working temperature of 350 ° C or higher. In order to meet the requirements of high-temperature working conditions, domestic and foreign ball valve manufacturers have optimized the sealing structure of high-temperature ball valves to significantly reduce their opening and closing torque, significantly extend their service life, and significantly improve their working performance. It has been improved.