Type needle valve actuating device according to the output shaft is divided into many rotary movement way, part of the rotary and linear reciprocating 3 kinds. Rotary rotary is more circle, more suitable for the stem or stem nut need revolving circle in order to fully open or close the valve, such as gate valve, globe valve, the output torque value of series of 40 ~ 10000), commonly (thrust is 20 ~ 1.1 million cows). Part of rotary is suitable for the stem within a circle in the rotation can be fully open needle valve manufacturer or close the valve, such as ball valve, butterfly valve, the output torque of the series is generally 125 ~ 125000). Linear reciprocating applicable to stem only do linear reciprocating motion can be fully open or close the valve, such as solenoid valve.

Nickel base corrosion resistance and promote the type valve of the main elements are as follows:

Copper, chromium, molybdenum. With good comprehensive performance, can be all kinds of acid corrosion and stress corrosion resistance. Early application of nickel copper alloy, also called monel alloy; Chromium and nickel alloy, nickel molybdenum alloy, nickel chromium molybdenum alloy, etc. Used in the manufacture of all kinds of corrosion resistant parts.

Nickel base type corrosion resistance and promote the main valve is chromium, molybdenum and tungsten alloy element, also contains a small amount of niobium, tantalum, and indium. Besides with mo resistance, its Yang resistance, corrosion resistance, weldability. Also can produce mo resistance components, also can be used as coating material, by overlaying welding and spraying process be coated on the surface the other substrate materials.

Stainless steel card sleeve joint can be manual cutting, but the aspects and the pipe centerline verticality can't more than half of the pipe diameter tolerance, remove the tube end of internal and external circular burr, metal dust and dirt. Stainless steel card set of joint works will steel pipe insert card set inside, use card sleeve nut locking, resistance card 12 needle valve sets, cut into the tube and sealing. It don't need to be welded with steel pipe connection, which is beneficial to fire, explosion and aerial work, and can solve the disadvantages of welding inadvertently bring.

Card sleeve joint length with sawing machine according to need or use pipe cutter tools such as cut, are not allowed to use a fuse or cutting wheel, remove pipe rust and dirt, and to ensure the pipe roundness and embedded steel pipe ferrule connector body, began to tighten card set of dynamics also shoulds not be too big, should be gradual card set screw thread tail or two-thirds.

Card set of commonly used joint 38 half pipe can be divided into hard and soft pipe joint and 38 coupling two kinds, if the pipe fittings and pipe connection method to 38 points, hard flaring type, 38 of 38 pipe joint and welding type three, soft tube joint is the primary withhold 38 type rubber 38 pipe joint.