Pneumatic valve manufacturing process characteristics

pneumatic valve manufacturing process characteristics of pneumatic valve parts is not much
it seems at first glance, simple structure, precision, in the machinery industry belongs to the simple components, but the core of the pneumatic valve sealing parts is particularly high requirements, sealing anastomosis must be zero to zero can achieve zero leakage of the air test. So its manufacture process is complex, technical difficulty is big, there are some features:
( ） Tell from the manufacturing material, the specifications of the pneumatic valve is various, used in the various fields of national economy, differ in thousands ways of its application, such as high temperature and high pressure, low temperature, cryogenic flammable and explosive, toxic, strong corrosive medium, such as working condition, material put forward strict requirements for pneumatic valves. In addition to iron, carbon steel, alloy structural steel, but also a large number of stainless steel (CrNi CrMoV CrMoAl nitriding steel, heat resisting steel, CrMnN acid precipitation hardened steel, dual phase steel, stainless steel, low temperature steel, titanium alloy, monel alloy, haggai's division is alloy, alloy and GCrW cemented carbide, etc. These high alloy material casting, welding, machining performance is very poor, bring great difficulty manufacturing process. With these materials are mostly high alloy, high strength, high hardness of precious materials, from the aspects of material selection, preparation, procurement there is a lot of difficulties. Some materials due to the use of small, hard procurement base.
（ ） From casting blank, the structure of most of the pneumatic valve blank USES a complex shell casting, not only requires good appearance quality, more dense inner quality and the good metallurgical structure, there can be blow hole, shrinkage, sand inclusion, cracks and other defects. So the complex casting process and heat treatment technology difficulty is high. In mechanical industry, pneumatic valve pressure shell casting blank casting difficulty than other mechanical components of casting more complex and difficult.
（ ） Tell from the machining process, because most of the hard, high corrosion resistance, high strength, high material cutting performance is bad, such as high alloy stainless steel, acid steel all have great toughness, high strength, heat dissipation and chip and strong work hardening tendency of shortcomings, such as viscosity, it is difficult to meet the requirements of size precision and smooth finish, brings to the machining of cutting tools, processes and equipment must be difficult. In addition, pneumatic valve sealing surface in machining precision, matching Angle, finish and matching sealing pair is also high, bring great difficulty machining.
（ ） Tell from the pneumatic valve parts process arrangement, pneumatic valve of the main parts number is not large, the structure is relatively simple, most of the size of the machining accuracy is not high, the external is coarser, that gives a person a kind of belong to the impression of simple machines. In fact, the heart of the pneumatic valve sealing parts but extremely sophisticated, the sealing surface of the '3 c' ( Flatness, smoothness and hardness) Requirements are high, and the two seal face of sealing pair of alignment is to achieve zero to zero, to meet the zero leakage air test. This rough benchmark to ensure heart precision of zero to zero, is the largest pneumatic valve processing technology difficulty.
（ ） Tell from the pneumatic valve test and inspection, pneumatic valve pressure pipeline is important to open/close, regulating elements, and the working condition of the use of pressure piping is differ in thousands ways, high temperature and high pressure, cryogenic, inflammable, explosive, poisonous strong corrosion at low temperature. But the pneumatic valve manufacturing working condition of test and inspection conditions is unlikely to be the same requirements, domestic and international various kinds of pneumatic valve test standards are near room temperature conditions, with gas or water as a medium for test. This is one of the most fundamental concerns, is normal factory test qualified products, pneumatic valve in the actual working condition of the harsh conditions may produce such as material selection, casting quality and sealing failure problem and difficult to satisfy the use requirement, also major quality accidents will happen. No wonder some dry for a lifetime of old pneumatic valve experts, the older the more formal, more dry more worry.