The cause of the deformation of pneumatic valve stem

the reason for the pneumatic pneumatic valve rod deformation stem mainly with comparison to compression, heat preservation is good, there is less prone to corruption and corrosion, it has both sides of the sealing function, more resistant to wear and tear, and its service life is longer. The pneumatic valve stem is deformation or fracture is so:
. Area of
pneumatic valve stem usually have broken parts in its up and down the bottom of the thread, because the local area is small, easy to appear the corresponding power concentration and beyond the standard.
。 When in open fracture
in general pneumatic valve stem is the most will appear when the fracture accident of a moment in the open. Mainly because ram is not out of pneumatic valve seat, pneumatic valve stem thread roots occurs on or next break, generally considered ram was stuck, all this is not reason, is not the most important.
。 Pneumatic valve body
pneumatic valve body lumen was shut down after the abnormal warming and step-down, that is to say after the pneumatic valve is closed, closed between upstream and downstream sides sealing surface midplane fluid pressure is far higher than the upstream pressure. Here's why:
( Inflation
( Pneumatic valve closed


pneumatic valve stem rod process in the process of pneumatic valve opening and closing, pull, pressure and under torsional force, and direct contact with the media, and packing friction and relative movement between at the same time, so when choosing pneumatic valve stem material, must ensure that its under the specified temperature of sufficient strength, good impact toughness, abrasion resistance and corrosion resistance. '
pneumatic valve stem and ball joints and pneumatic valve stem and valve body contact should be an antistatic mechanism, prevent electrostatic agglomeration on the sphere. Pneumatic valve stem safety design should prevent was 'blown out' under the working pressure, pneumatic valve stem blow-out proof flange of the disposal of a circular ring, in order to reduce friction coefficient.
traditional pneumatic valve stem
the characteristics of the machining process. Traditional pneumatic valve stem thread USES the spiral, precision is inaccurate; And the traditional vulnerability without crumbs screw rolling rolling dies, easy deformation, distortion.
。 Polished rod parts adopt grinding machine precision is not high, time consuming,
. Pour off parts adopt two clamping turn end seal, concentricity, pour sealing leakage easily.
。 End parts adopt milling machine dial indexing, processing, slow process, takes a long time.
the characteristics of the new type of pneumatic valve rod manufacturing process
. New type of pneumatic valve rod thread with homemade extrusion, high intensity, precision.
。 Threaded parts and parts of the polished rod of concentric, overcome the long plagued domestic thread rolling process easy distortion, vulnerability thread rolling die.
。 Precision of the polished rod parts mirror effect, easy opening and closing, good seal.
。 Pour off parts adopt numerical control technology a molding, high precision, pour sealing performance is good.
。 Side parts forging forming technology on T slot, high efficiency and low cost.
。 Pneumatic valve stem of a complete set of production technology reached the international advanced level in strong corrosion, volatile and toxic harmful process conditions, once the pneumatic valve stem seal is broken, strong corrosion, volatile and toxic and harmful medium leakage from the pneumatic valve pneumatic control valve stem, to the serious consequences of surrounding environment and personal safety. The corrugated pipe pneumatic stem seal form is a way to solve the above problem. Generally speaking, stainless steel bellows. The special structure of pneumatic valve cover protection control pneumatic valve packing to avoid contact with fluid, once the corrugated pipe burst, stuffing box at the top of corrugated pipe structure can prevent corrugated pipe rupture failure which is caused by serious consequences. In engineering practice, the choice of the form of bellows seal should fully consider bellows sealed pressure rating would reduce with the temperature increases, the fluid solid particles cannot exist, and the longest of the corrugated pipe material circulation life, etc. In some process of medium corrosion resistance of stainless steel is strong corrosion, medium such as process of wet chlorine, wet chlorine contained traces of hydrochloric acid can be made of stainless steel bellows was quickly corrosion.

pneumatic valve rod manufacturer: zhejiang add knight pneumatic valve rod co. , LTD