Valve type of main valve

Shanghai Qigao Valve Manufacturing Co., Ltd. is the leading and largest manufacturer and supplier of butterfly valves, ball valves, gate valves, safety valves, pressure reducing valves, regulating valves, globe valves and other general purpose valves in China.

Electric valve

With the development of industrial automation, electric valves are more popular than pneumatic, hydraulic and other devices because of their advantages of easy access to power sources and no maintenance in general. Electric valves must have higher reliability and safety in industrial occasions. When the valves can ensure performance and life, the safety and reliability of the electric valves depend on the electric actuators. Therefore, the performance and control level of the electric actuators are the comprehensive performance of the technical level of the electric valves.

Pneumatic valve

Pneumatic valve is an important device in the automation of industrial pipeline system. It installs pneumatic actuator on the basis of ordinary valve and drives the actuator to work by air pressure. From the movement of the valve is generally divided into: straight stroke and angular stroke; from the actuator is generally divided into: single-acting and double-acting. Pneumatic valves through the output signal to achieve the valve cut-off, switch-on, adjustment and other functions, generally pneumatic valves are equipped with electromagnetic valves, air source triple, limit switches, positioners and other accessories used together.

Power station valve

"Power Station Valve" also known as the power station special valve, mainly applicable to thermal power plants in various systems of the pipeline, cut off or through the pipeline medium. Applicable medium: water, steam and other non corrosive media. Compared with other valve products, power station valves are characterized by high temperature and pressure, unique self-sealing design, the higher the pressure, the more reliable the seal. Because of the special characteristics of performance and technology and working conditions, the products have formed the characteristics that can not be replaced by other products.

Chemical valve

Corrosion protection is the most important part of chemical equipment in corrosive medium condition. If the metal material of chemical valve can not be selected correctly, it will damage the equipment slightly, and even cause accidents and disasters. According to relevant statistics, about 60% of the damage to chemical equipment is caused by corrosion, so in the selection of chemical equipment, we should first pay attention to the scientific selection of materials.

butterfly valve

The shutter of the butterfly valve is a disc-shaped valve plate which rotates around a fixed shaft in the valve body between 0 and 90 degrees to open, close and regulate the fluid pipeline. According to the structure, butterfly valve can be divided into: central sealing, single eccentric sealing, double eccentric sealing and three eccentric sealing; according to sealing materials, butterfly valve can be divided into: soft sealing and metal hard sealing. The butterfly valve has the advantages of simple structure, light weight, large caliber, small flow resistance, small opening force, fast opening and closing speed, and good sealing performance. Butterfly valves are developing rapidly, and are moving towards high temperature, high pressure, large caliber, high sealing, excellent regulation performance, long service life and other directions to replace the use of gate valves, globe valves and other valves.

Regulating valve

Regulating valve belongs to the control valve series. Its main function is to adjust the pressure, flow, temperature and other parameters of the medium. It is the final control element in the process loop. The control valve can be divided into straight stroke and angular stroke according to stroke characteristics. Straight stroke includes: single seat valve, double seat valve, sleeve valve, angle valve, three-way valve, diaphragm valve; Angular stroke includes: butterfly valve, ball valve, eccentric rotary valve, full-function ultra-light regulating valve. Regulating valves can be divided into: pneumatic control valve, electric control valve and hydraulic control valve; according to the regulation form can be divided into: regulation type, cut-off type, regulation cut-off type; according to flow characteristics can be divided into: linear, equal percentage, parabola, fast opening. The regulating valve is suitable for air, water, steam, corrosive medium, mud, oil and other media.

Gate valve

Gate valve is a common cut-off valve, mainly used to connect or cut off the medium in the pipeline. The gate plate of the gate valve is sealed on both sides, and the movement direction is perpendicular to the flow direction of the medium. The gate valve is mostly forced to the valve seat by external force to meet the sealing requirements. According to the internal structure, it can be divided into: wedge type single sluice plate, elastic gate type, double sluice plate type and parallel gate type. It can also be divided into open pole gate and dark rod gate valve. Often used in normal open and close occasions, it has the advantages of small flow resistance, wide application range, not limited by the flow direction of media, suitable for making large-diameter valves, etc. It also has the shortcomings of sealing surface wear and tear is not suitable for repairing, shape size is high, open and close time is long, not suitable for adjusting the flow of media and other shortcomings.

Globe valve

The performance of the globe valve mainly plays the role of cutting off the pipeline medium. Compared with gate valve, the valve has better regulating performance, less opening height, shorter closing time, convenient manufacture and maintenance, the sealing surface is not easy to wear and scratch, good sealing performance and long service life; the valve body structure design is more tortuous, so the flow resistance is large, energy consumption is large; suitable for steam, oil and other media, not suitable for use It is a medium with large viscosity, particle size, easy coking and easy precipitation. Medium and high pressure globe valves, large caliber globe valves can be balanced structure, globe valve extension product - throttle valve, by changing the cross-section of the flow channel to control the pressure and flow of media, except the opening and closing parts using streamline cone, most of the same as the globe valve.

Safety valve

Safety valve is installed on equipment, containers or pipelines, for overpressure protection, when the pressure in the container or pipeline exceeds the allowable value, the valve automatically opens the discharge medium; when the pressure is reduced to the prescribed value, the valve automatically closes. The safety valve can be divided into direct acting mode and pilot type according to the driving mode. The direct safety valve is driven directly by the system pressure of the valve inlet. At this time, it is driven by a spring or a heavy hammer.

Globe valve

Ball valve is a widely used valve. The opening and closing parts of the ball valve are spheres with circular through-holes. The sphere rotates with the stem to cut off, distribute and change the flow direction of the medium. The V-shaped open ball valve can also be used for flow regulation. Ball valve has the following advantages: quick opening and closing, easy operation; simple structure, light weight, good sealing performance; fluid resistance is small; suitable for low temperature, high temperature, high pressure, viscosity medium. The structure of the ball valve is divided into floating ball and fixed ball. The floating ball valve compresses the ball at the outlet of the valve seat by the medium pressure; the ball of the fixed ball valve is supported by two bearings above and below, and the valve seat is pressed tightly to the ball body by the spring and the medium pressure to realize the seal.

Pressure relief valve

The pressure reducing valve is a valve which reduces the inlet pressure to a certain outlet pressure by adjusting and keeps the valve stable. According to the structure, it can be divided into piston type pressure reducing valve, membrane type pressure reducing valve, bellows type pressure reducing valve, etc. Piston type pressure relief valve is small, easy to adjust, widely used, but the sensitivity is lower than film type, manufacturing process requirements are high, suitable for air, water, steam and other media. Especially when the medium temperature is high, a large number of piston type pressure reducing valves are chosen. Membrane pressure relief valve has high sensitivity, but the film is easy to damage, and the use of temperature is limited, often used in water, air and other low temperature and pressure occasions. The bellows type pressure reducing valve has high sensitivity, but the manufacturing process is complex and the cost is high.

Check valve

Check valve, also known as check valve, is a kind of valve that can automatically prevent the backflow of medium. The valve disc is opened by the action of medium. At this time, the check valve belongs to the open state. Check valves are generally divided into lifting type, swing type, butterfly type, diaphragm type and other structural types. The closing part of the lift check valve moves along the center line of the valve seat; the closing part of the swing check valve moves around the fixed shaft in the valve body; the structure of the butterfly check valve is similar to the butterfly valve, with simple structure, small flow resistance and small water hammer; the diaphragm check valve uses the diaphragm as the closing part, which has simple structure, small water hammer, but is subject to medium pressure and small water hammer. Temperature limits.

Solenoid valve

There is a close cavity in the solenoid valve. There are through holes in different positions. Each hole leads to different oil pipes. There are valves in the middle of the cavity and two electromagnets on both sides. Hydraulic oil enters different drainage pipes and then pushes the oil-rigid piston through the pressure of the oil. The piston then drives the piston rod, which drives the mechanical device. This controls the mechanical movement by controlling the current of the electromagnet.

Hydraulic control valve

Hydraulic control valve is a series of valves controlled by the pressure of the fluid itself, which is only suitable for pipelines with medium of water. Hydraulic control valve generally has a main valve and other accessories, such as conduit, pilot valve, ball valve, needle valve, pressure gauge and other components. According to different purposes, functions and places, different products are extended, such as remote control float valve, pressure reducing valve, flow control valve, pump control valve, water level valve and so on. Hydraulic control valves are divided into diaphragm type and piston type, which are driven by the pressure difference between the upper and lower reaches. The main valve disc is in the state of fully opening, completely closing, and medium regulating through the pilot valve control and automatic hydraulic regulation.

Filter

Filter is an indispensable auxiliary component in various pipeline systems. Its main function is to filter impurities in the medium, protect equipment and accessories (such as compressors, pumps, meters, etc.) from wear and clogging, and improve product purity, purify gas and other functions. Filter mesh internals can be replaced, according to the requirements of the optional precision of 18-500 mesh filter, filter mainly Y-type filter, U-type filter, T-type filter, automatic cleaning filter, basket filter, automatic blowdown filter, self-cleaning water filter, hand brush filter, etc., widely used in oil Chemical industry, metallurgy, chemical fiber, medicine, food and other industrial systems.

Drain valve

The main function of the trap is to automatically remove condensate, air and other non-condensable gases from steam equipment or pipelines, while preventing steam leakage. It is also known as a trap or blockage drain valve. In principle, the trap is fully open or fully closed, according to the type of different, there are two types of continuous discharge and intermittent discharge. The trap is a kind of energy-saving product which ensures the temperature and heat required by various heating process pipelines and equipment to work correctly. According to the working principle, traps can be divided into: mechanical traps (inverted bucket, floating ball, floating bucket, etc.); thermodynamic traps (disc, pulse, etc.); thermostatic traps (bimetal sheet, bellows, etc.).

Balance valve

Balance valve is a special function of the valve, the valve itself is special, only in the use of functions and places are different. In some industries, because of the large pressure or flow difference of the medium (all kinds of flowable substances) in each part of the pipe or container, in order to reduce or balance the difference, a valve is installed between the corresponding pipes or containers to regulate the relative balance of pressure on both sides, or through the flow method to achieve the flow balance. Heng.

Needle valve

Instrument needle valve is an important part of instrument measuring pipeline system, mainly including globe valve and ball valve, whose function is to open or cut off pipeline access. The jacketed instrument valve has the advantages of convenient installation and disassembly, tight connection, fire protection, high explosion and pressure resistance, good sealing performance and so on. It is an advanced connecting valve in power station, oil refining, chemical equipment and instrument measuring pipeline. The needle-shaped globe valve has good sealing performance and long service life. Even if the sealing surface is damaged, it can continue to use only by replacing the vulnerable parts.

Discharge valve

The discharging valve is mainly used for the bottom discharging of the reflector, tank and other containers, and is welded to the bottom of the tank and other containers by means of the bottom flange of the valve, thus eliminating the residual phenomenon of the process medium usually at the outlet of the container. The discharging valve is designed to be flat-bottomed and V-shaped according to the actual situation, and provides two working modes of disc lifting or descending. It is widely used in chemical, petroleum, metallurgy, pharmaceutical, pesticide, dyestuff, food processing and other industries. Operating modes are: manual, pneumatic (spring reset, double-acting, with and without handwheels), electric, hydraulic, gear, etc.