Soft seal plug valve is applicable for medium having corrosion or toxicity. The materials of valve cannot cause pollution to medium. For different medium, body is made of alloy steel, carbon steel and stainless steel. A. For different temperature, lubricating liner of plug valve is made of F4, F46, PVDF, PP, PO, PE, etc, having good lubrication. Seal pairs have low coefficient of friction, ensuring plug rotating flexibly and long service life. B. Ends of body adopt double groove seal...

1. According to structure, categories of plug valves can be classified into cylindrical plug valves and conic plug valves. 2. Materials of seal face (1) Non metal sealed plug valves: Seal face of plug valves is made of PTFE, rubber, nylon, PPL, flexible graphite and other soft materials. (2) Metal sealed plug valves: The material of seal face is metal. (3) Oil Slick sealed plug valves: Utilize grease to seal. 3. Working pressure (1) Vacuum plug valves: Working pressure is lower than...

Forging is a kind of process that using metal forming machinery presses to metal billet, making it deform plastically to acquire mechanical properties, shape and size. Forging is a common forming process widely utilized in machinery. Forging can eliminate cast loose and welding holes inside metal. The mechanical properties of forging are more excellent than castings. Based on temperature, forging can be classified into cold forging and hot forging. Generally, cold forging is...

Check valve allows medium to flow in one direction, stopping counter flowing. The valve operates automatically. With the pressure of fluids, the disc opens. When fluids counter flowing, pressure make disc coincide with base and cut off medium. Check valve is classified into swing check valve and lift check valve. Swing check valve has a hinge. To ensure disc can reach to the appropriate position on base, the disc is put inside hinge so that disc has adequate swing space and makes disc...

The valve, commonly utilized in water supply system, includes gate valve (screw thread, flange), globe valve (screw thread), check valve (screw thread, flange), butterfly valve, etc. Gate valve: Actuation of gate valve can be classified into clear bar, dark bar, manual, electric and motor. Gate valve has small fluid resistance, small force. It allows fluid to flow in any directions. But gate valve has complicated structure. Sealing face of gate valve is easily polished by impurities or particles...

The common utilized valves in heating system include globe valve, gate valve, butterfly valve, ball valve, check valve, safety valve, pressure reduction valve, pressure maintaining valve, balanced valve, regulating valve and other self-operating or electric regulating valve. Globe valve: Globe valve is used to cut off medium flowing. It has function of regulating and large pressure losses. Globe valve is commonly utilized for heating system to cut off steam in pipe. "J" represents...

Check valve is a kind of valve that depends on flow of medium to open or close disc. Check valve is used to avoid back flow of valve. Based on structure, check valve can be classified into lift check valve, swing check valve, butterfly check valve, pipe valve. 1. Lift check valve: The disc of lift check valve can slide along vertical center line of body. Lift check valve can be only used for horizontal pipeline. The disc of high pressure small caliber check valve uses ball. The shape...

As one of terminal control components for automatic control system, regulating is a key component for automatic control system. Generally, regualting valve is positively used (installed), for it having simple flow path and small resistance . However, unger high pressure, reverse installation is more suitable for regulating valve, which can improve unbalanced force and reduce damage to valve bore. Otherwise, it can avoid coking and occlusion of regulating valve. When angle regulating...

Regulating valve, also called as control is a kind of valves which receive control signal and change flow of fluid with the help of motive power. Regulating valve consists of actuator and valve. Based on motive power, regulating valve can be classified into pneumatic regulating valve(using compressed air), electric regulating valve(using electricity) and hydraulic regulating valve(useing pressure of liquid medium). Regulating valve has a lot of varieties. The most common used regulating...

Many people might take it for granted that when they turn on their water everything will flow normally. But some homes might be missing an important piece of equipment you may never have heard of -- pressure regulating valve. Margaret Cantrell learned the hard way. She has an expensive mess on her hands. One morning she found her patio flooded after the top of her water heater had blown apart. "It was like a fire hydrant," she said. Metro Water Services...

Design of disc Gate valves with NPS>/2 are of wedge flexible gate. Gate valves with NPS＜2 are of wedge solid gate. Body and bonnet connection The body and bonnet of Class 150 - 900 gate valves are usually connected with studs and nuts. And the body and bonnet of Class 1500 - 2500 gate valves are usually of pressurized seal design. Gasket of cover flange Carbon steel or stainless flexible steel graphite combined gasket is used for Class 150 gate valve; Stainless...

As we know, gate valve is widely used to control the flow of liquid from straight line medium in many places. The instance ones would be in irrigation, also apply for various chemical plants to manage the path of different types of fluids. On the basis of detailed designs, Gate valve can be divided into several types. The solid wedge valve and flexible wedge are the most popular valves. There are many kinds of bendable wedge valve, which use double disc parts that are bendable. Parallel...