Stainless steel needle valve body etc are larger and brass pin type valve, because generally make type stainless steel needle valve With temperature is higher, the pressure is high, so ball valve manufacturer in the central stuffing box design this doing is higher, in case of leakage with the rising of middle pressure and temperature. And brass type needle valve structure is simple, do not need to do is too high, of central for use The condition of pressure and temperature are relatively low. Type of valve and brass and stainless steel needle valve type of production cost is large, so the price of the stainless steel needle valve type is relatively higher, and the brass type needle valve price is relatively cheap.
Stainless steel needle valve and brass needle valve applications:
Stainless steel needle valve is widely used in power plant, chemical, pharmaceutical, food, hydraulic, instrumentation and other industrial fields. Suitable for water, steam, oil, nitric acid, acetic acid, medicines and other media, to adapt to the medium up to 600 ℃. Brass type needle valves only Suitable for medium such as water and oxygen, to adapt to the pressure pipeline equipment within 16 kilograms commonly, do not use in high pressure pipeline equipment.
Type stainless steel needle valve is whole process material 304316321201 stainless steel forging processing production of needle valve, brass is made by a brass alloy casting process of needle valve. Stainless steel material 14 needle valve has corrosion resistance, resistance to high pressure, High temperature resistant, high cleanliness, a lot of advantages. The brass or copper materials do not have the advantages of resistance to high pressure, high temperature resistant, relative to the stainless steel needle valve as many, the scope of use type stainless steel needle valve is widely used.
Type stainless steel needle valve and instrumentation valve body and internal parts are all materials with solid or forging bar solid body directly, high density, tensile performance is strong, adopts CNC precision machining, precision degree is high, good seal. Brass type needle valve and yellow Brass instrument valve technology for forging casting body, low tensile performance, corrosion resistance and poor, not suitable for high temperature and high pressure, bad working conditions, such is only suitable for plumbing, air conditioning and other devices.
The daily maintenance of instrument type needle valve:
1, regularly check the oil level medium oil height, oil mist detector discretion to support him, on a regular basis to Chu water blocking device bottom dust accumulation of condensed water and impurities.
2, check the air pressure and adjust the flow of one-way throttle valve 38 needle valve has enough opening and closing force, flexible motion;
3, check whether testing hole leakage or leakage, are leaking air leakage need to replace the seal in time. High pressure water descaling injection valve not only stable high Xiao controllable operation, also should pay attention to the An run.