Pneumatic valve advantages stainless steel pneumatic valve

Pneumatic valve advantages stainless steel pneumatic valve With the rapid development of modern automation technology, the use of valve automation also gradually replace manual operation, large torque, pneumatic valve movement, pneumatic valve switching speed can be adjusted, simple structure, easy maintenance, in the process of action for buffer characteristics of the gas itself, is not easy to damage due to get stuck, but must have a gas source, the operation is simple and its control system. Pneumatic valve responsive, safe and reliable, Pneumatic valve action distance is large, pneumatic valve switch action speed can be adjusted, simple structure, easy maintenance, action process due to the buffer characteristics of the gas itself, not easy to be stuck and damaged, but there must be a gas source, and its control system is more complex than the electric valve. Pneumatic valve response sensitive, safe and reliable, many high control requirements of the plant for pneumatic instrument control components set up compressed air station. Pneumatic accessories: positioner - mounted on the cylinder, can adjust the valve switch degree, so as to control the flow of media, positioner with signal feedback and no signal feedback, explosion-proof and non-explosion-proof several, explosion-proof grade requirements, depending on the site requirements. Solenoid valve - electrically controlled pneumatic valve switch, general voltage 220V AC and 24V DC, explosion-proof and non-explosion-proof, explosion-proof grade depends on the site conditions. Limit switch - mounted on the cylinder to show whether the valve is open in position, with indication. Filter - mounted on the cylinder, can clean the air, add lubricating oil and other functions, so that the cylinder use longer. Stainless steel pneumatic valve Pneumatic ball valve is equipped with pneumatic actuators. The execution speed of the pneumatic actuator is relatively fast, the fast switching speed of 0.05 seconds/time, so it is usually called the pneumatic quick cut off ball valve. Pneumatic ball valves are usually equipped with various accessories, such as solenoid valves, air source processing triples, limit switches, positioners, control boxes, etc., to achieve local control and remote centralized control The working principle of Pneumatic ball valve only needs to use the pneumatic actuator with the air source rotation 90 degrees operation and a small rotational moment can be closed tightly. Completely equal valve body cavity for the medium provides little resistance, straight through the flow channel. Ball VALVES are GENERALLY CONSIDERED SUITABLE FOR DIRECT OPENING AND CLOSING, BUT RECENT DEVELOPMENTS have DESIGNED THEM TO THROTTLE and CONTROL FLOW. The main feature of ball valve is its compact structure, easy operation and maintenance, suitable for water, solvents, acids and natural gas and other general working media, but also suitable for poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be integral, can also be combined. Pneumatic ball valve can be divided according to the structure: A floating pneumatic ball valve Pneumatic ball valve ball is floating, under the action of medium pressure, the ball can produce a certain displacement and tightly pressed on the sealing surface of the outlet end, to ensure that the outlet end is sealed. The structure of the floating pneumatic ball valve is simple and the sealing is good, but the ball bearing the load of the working medium is all passed to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the sphere medium. This structure is used for medium and low pressure ball valves. Two, fixed ball pneumatic ball valve The ball of pneumatic ball valve is fixed and does not move after compression. Fixed ball valve with floating seat, by medium pressure, seat movement, so that the sealing ring pressed on the ball, to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball, and the operation torque is small. It is suitable for high pressure and large caliber valves. In order to reduce the operation torque of pneumatic ball valve and increase the reliability of sealing, in recent years, oil seal ball valve has appeared, not only in the sealing surface pressure injection of special lubricating oil, to form a layer of oil film, that is to enhance the sealing, and reduce the operation torque, more suitable for high pressure and large caliber ball valve. Three, elastic ball pneumatic ball valve The ball of pneumatic ball valve is elastic. Ball and seat ring are made of metal materials, sealing ratio pressure is very large, relying on the pressure of the medium itself has not reached the requirements of sealing, must apply external force. This valve is suitable for high temperature and high pressure media. The elastic sphere is an elastic groove at the lower end of the inner wall of the sphere, and the elasticity is obtained. When CLOSING THE CHANNEL, USE THE WEDGE TIP OF THE STEM TO OPEN THE BALL AND PRESS THE SEAT TO SEAL. By RELEASING THE WEDGE HEAD BEFORE TURNING THE BALL, THE BALL RETURNS TO ITS ORIGINAL SHAPE, ALLOWING A SMALL CLEARANCE BETWEEN THE BALL AND THE SEAT, REDUCING FRICTION AND OPERATING TORQUE ON THE SEALING SURFACE. Pneumatic ball valve according to its channel position can be divided into straight-through, three-way and right-angle. The latter two ball valves are used to distribute the medium and change the flow direction of the medium. 1 pneumatic ball valve some switch position indication: valve body, ball and handle an assembly unit, the handle pointing to the pipeline direction of the valve is open, the handle vertical pipeline direction of the valve is closed; Even the worm gear head has on/off indication. Locking DEVICE DESIGN: IN ORDER TO PREVENT THE WRONG OPERATION OF THE SWITCH, THE FLAT HEAD STEM IS USED TO SET THE LOCKING HOLE in THE SWITCH position TO ensure THE VALVE is in the correct position. Blowout proof guide stem. The stem is inverted from the valve body or blow proof structure, and sealed by the sealing ring, even if there is a fire, packing burn, the stem protrudation part can also be close contact with the sealing surface of the valve body, can effectively prevent leakage and stem fly out, reduce accident losses. 4 Anti-static design: the use of chromium nickel stainless steel spring and ball to make the sphere, stem and valve body conductive between each other, so as to completely release the static electricity caused by friction between the non-metallic seat and the sphere. 5 fire structure: in case of fire or abnormal heating so that PTFE softening burn, the seat bearing ring fire sealing surface can contact with the ball, play a sealing role and meet the API607 and API6FA specification requirements. Fire safety design, processing a fire seal lip inside the supporting surface of the valve seat, when the fire valve burns, the metal to metal seal between the fire seal lip and the sphere is formed, the valve packing gasket is made of temperature-resistant graphite material, to ensure that the valve has no leakage in the case of fire 6. Automatic pressure relief: When abnormal pressure boost occurs due to temperature rise in the stagnant medium in the valve chamber, the valve seat outlet has automatic pressure relief function. At the same time, a safety valve can be installed on the valve body to ensure that the valve body has automatic pressure relief function and ensure the pipeline safety. 7 SEALED emergency rescue: due to the impurities in the medium or fire caused by the valve seat sealing accident failure, grease valve provides a quick connection with grease injection, convenient and fast to inject the seal grease into the seat sealing part, alleviate leakage. 8 two-way seal fixed ball valve: the company developed a series of two-way seal ball valve, the import and export two-way seal, so that the seal is more reliable, no matter single pressure valve, the cavity pressure (no matter which pressure test method) can reach zero leakage. Pneumatic ball valve ball. The upper and lower stem are fixed. When working, the fluid pressure will not make the ball move to the seat, the seat will not bear too much pressure and deformation. The stem part is equipped with self-lubricating bearings to reduce friction, small switch torque, and the two seats are preloaded with spring. The seal is made of PTFE INlaid into the steel solid, and a spring is arranged at the back of the steel ring to ensure that the seat is close to the ball. When the abnormal rise of pressure in the valve cavity exceeds the spring jacking force, the seat backs away from the sphere, to achieve automatic pressure relief effect, the seat automatically reset after pressure. The advanced structure makes the sealing performance of the fixed ball valve stable, labor-saving operation, long service life, very suitable for long pipeline and general pipeline. Universal ball valve has full diameter and reduced diameter of two types of structure. Ball VALVES USED FOR CONVEYING attached and slagging media pipelines should be full diameter to facilitate the passage of regular wax scrapers. Reduced-diameter BALL VALVES SHOULD BE USED FOR CONVEYING GAS OR MEDIUM WITH PHYSICAL PROPERTIES SIMILAR TO WATER, BECAUSE THEIR WEIGHT IS ABOUT 30% LIGHTER THAN FULL-diameter BALL valves, which is conducive to reducing pipeline load and reducing costs. Ball valve is a kind of 90 rotation Angle valve, good sealing performance, (full diameter ball valve) flow coefficient flow resistance coefficient is small, simple structure, long service life, easy to maintain. Products are used in chemical, petroleum, textile, electric power, food and pharmaceutical, refrigeration, paper industry system control. Key words: ball valve pneumatic ball valve Note: The above article is organized and published by Shanghai Zhongye Valve Co., LTD