The oxygen valve industry characteristics of pneumatic valve _ pneumatic components factory

Summary of pneumatic valve pneumatic pneumatic valve oxygen. Oxygen pneumatic valve is suitable for coal water slurry pressurized gasification unit oxygen pipeline, imported technology GE ( Texaco) Furnace, furnace shell, yankuang four nozzle CWS gasifier and domestic space furnace technology, in both oxygen and nitrogen purging piping or have the effect of fast cutting, it has a larger output power, must be suitable for dynamic stability requirements, high pressure, large flow, low leakage. Oxygen characteristics of pneumatic valve, pneumatic valve to realize the goal of safe and stable can be used for a long time, it is necessary to meet the anti-static, prevent leakage, leakage, anti jamming and switch is not free of problems. （ 1) Antistatic design (1) component design: the body flow light the whole processing, the valve body cavity smooth transition, such as seat parts without sharp corners, no blade design. Trim surface bright and clean degree reach ISO8501 - 1 sa2 requirements. Anti-static threaded hole (2) the valve flange design, the use of grounding connection, prevent the generation of static electricity. （ 2) Prevention of leakage of oxygen pneumatic valve is used in high temperature and high pressure environment, the opening pressure difference is very big, plus after degreasing and drying, compared to common seal face multiplied, the sealing surface friction coefficient, which resulted in increased friction. In the harsh conditions, to ensure the valve without leakage, need to design the following several aspects: (1) seal of spray welding material collocation: in the scene, when using pneumatic is dry friction between core and valve seat, once the cemented carbide coating bonding, valve switch can cause a sealing surface strain. Through a lot of seal material ratio test, pick out the characteristics of compressive resistance, oxidation resistance, good thermal conductivity of the oxygen pneumatic valve is special material. (2) spring pre-tightening force and seat ring is the relationship between the compression quantity in advance: choose butterfly spring. Provided by the butterfly spring pre-tightening force on the one hand, under the condition of low pressure to seat with air core tightly, realize seal; On the other hand squeeze so that it has expanded graphite ring, a combination of these, to ensure that the valve seal BuKa death again at the same time. Through a large number of experiments, the quantitative compression technology, strictly control the amount of compression. (3) the valve cavity pressure relief structure: when oxygen pneumatic valve in a seated position, the valve body, valve seat and pneumatic core constitute a closed space ( Also called lumen) 。 Lumen of the medium effect exists in the valve seat ring area difference S1, pressure P1. Valve after the medium effect on the valve seat also exist annular area of S2, poor pressure P2. The seat spring pre-tightening force under F. Cavity of medium pressure P1 rose to a certain value, namely P1 * S1 > ( P2*S2+F） , spring will be compressed, valve seat and core pneumatic separation, the midplane of the high pressure medium by pneumatic core and valve seat gaps between discharge and realize the discharge pressure. （ 3) Prevent leakage oxygen once leakage, the consequence is very serious, high-speed rushed out of the oxygen in the leak easily produce local heat aggregation effect, thus form a flame and explosion. To prevent oxygen pneumatic valve in use after period of time, packing caused by extrusion deformation, leakage, my company to make the following design: (1) dynamic load clamp design: packing clamp bolts to install butterfly spring, continue for packing of component loading force, ensure lasting tight seal between stem and packing, thus ensuring meet TA - packing leakage level Luft environmental standards. (2) with double bearing design and the bearing chamber seal design, solve in the process of opening and closing of valve leakage problems caused by the valve stem is cheap. （ 4) Prevent unsmooth, not free oxygen, pneumatic valve, acerbity, switch of the reason is various, mainly including three categories: 1, the actuator selection problem 2, the valve stem and bearing design and processing technology does not pass 3, improper pneumatic spray coating material selection and the valve seat. Generally most of the reason for the latter two. (1) the valve stem and prone to stick in the process of bearing the load switch, bite, will cause the valve to switch. Aiming at this situation, with double bearing and hardening treatment technique, to overcome the high temperature and high pressure and pure metal bonding under dry friction condition. (2) pneumatic pneumatic valve core and valve seat spray welding oxygen is special materials, valve seat sealing surface can't design too wide at the same time, the length of the seat can't be too long, to avoid the valve switch seat ectopic and stuck appeared in the process of pneumatic core. , the cut-off valve JY41W oxygen _ hyperbaric oxygen valve globe valve structure J641H/P pneumatic globe valve