In the production process, in order to make the media pressure, flow and other parameters in line with the requirements of the process, the need to install the adjustment mechanism to adjust the above parameters. The main working principle of the adjustment mechanism is to change the flow area between the valve disc and the valve seat to achieve the purpose of adjusting the above parameters. Belong to this type of valve collectively referred to as the control valve, which is divided by the medium itself to drive the drive called self-drive control valves such as pressure reducing valve, regulator valve, where the leading power-driven (such as electricity, compressed air and liquid Power) known as his drive control valve, such as electric control valve, pneumatic control valve and hydraulic control valve. The following are the same as the "
The strength of the valve performance refers to the valve to withstand the pressure of the media capacity. The valve is a mechanical product that is subjected to internal pressure and must therefore have sufficient strength and rigidity to ensure long-term use without cracking or deformation. The following are the same as the "
A good product not only the quality of the product itself is better, the most important thing is to let everyone know it, familiar with it, use it rationally to play its greatest role. The following are the same as the "
The scale of the valve selection must be on a safe, applicable and reliable basis. The following are the same as the "
Economy is not only the price of the product, but also give priority to its function and quality and installation and maintenance and other accessories required costs. The following are the same as the "
More importantly, a valve in the entire control system and even the production line in the cost of minimal, if the covenant small and wrong caused damage is huge. The following are the same as the "
Gate valve is one of the commonly used cut-off valve, in full open when the entire flow through, this time the minimum pressure loss of medium operation. Gate valves are usually suitable for applications that do not require frequent opening and closing, and to keep the shutter fully open or fully closed. The following are the same as the "
From the structural form, the main difference is the form of the sealing element used. According to the form of sealing elements, the gate valve is often divided into several different types, such as: wedge gate valve, parallel gate valve, parallel double gate valve, wedge double gate gate and so on. The following are the same as the "
Gate valve for pressure, temperature and caliber range is very large, especially for medium and large diameter pipes. The following are the same as the "
Not suitable for use as a regulator or throttling. For high-speed flow of the medium, the gate in the local open conditions can cause the gate of the vibration, and vibration may damage the gate and the valve seat sealing surface, and throttling will cause the gate to withstand the erosion of the media. The following are the same as the "
Stop valve is a commonly used cut-off valve, mainly used to connect or cut off the medium in the pipeline, generally not used to adjust the flow. Stop valve for pressure, the temperature range is large, but generally used in medium and small diameter pipe. The following are the same as the "
The valve stem of the globe valve is perpendicular to the sealing surface of the valve seat. The stem opens or closes with a relatively short stroke and a very reliable shut-off action, making it ideal for cutting or throttling and throttling media. Once the valve valve valve in the open state, its valve seat and the valve seal surface is no longer between the contact, so its sealing surface mechanical wear less, and has a very reliable cut off the action, get this valve Very suitable for the media as a cut or adjust and throttling use. The following are the same as the "
Since most of the valve seat and the valve flap are easier to repair or replace the sealing element, it is not necessary to remove the entire valve from the pipeline, which is suitable for the welding of valves and pipelines. Media through the flow direction of such a valve has changed, so cut-off valve flow resistance is higher than other valves. The following are the same as the "
Commonly used cut-off valve are the following:
1) angle cut-off valve; in the angle-type valve, the fluid only need to change the direction, so that the pressure drop through the valve than the conventional structure of the cut-off valve. The following are the same as the "
2) DC cut-off valve; in the DC or Y-shaped valve, the valve body flow channel and the main channel into a slash, so that the flow of the degree of damage than the conventional cut-off valve is small, and thus through the valve pressure loss Of the small. The following are the same as the "
3) plunger stop valve: This form of cut-off valve is a conventional cut-off valve variant. In the valve, the valve flap and valve seat is usually based on the principle of plunger design. The valve disc is polished into a plunger connected to the valve stem, and the seal is achieved by two elastomeric seals on the plunger. The two elastomeric seals are separated by a collar and are pressed against the seal around the plunger by the load applied to the bonnet by the bonnet nut. Elastic seals can be changed and can be made from a wide variety of materials. The valve is mainly used for "on" or "off," but with specially designed plungers or special rings and can also be used to regulate flow . The following are the same as the "
The butterfly plate of the butterfly valve is installed in the diametrical direction of the pipe. In the butterfly valve body cylindrical channel, disc-shaped butterfly plate around the axis of rotation, the rotation angle of 0 ° ~ 90 ° between the rotation to 90 °, the valve is fully open card status. The following are the same as the "
Butterfly valve structure is simple, small size, light weight, only a few parts from the composition. And only need to rotate 90 ° to quickly open and close, simple operation, while the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body. Therefore, the pressure drop caused by the valve is very small, so it has better flow control characteristics. Butterfly valve with a sealed seal and metal seal two sealed type. Elastic seal valves, seals can be embedded in the valve body or attached to the butterfly plate around. The following are the same as the "
The use of metal sealed valves generally have a longer life than elastically sealed valves, but it is difficult to achieve complete sealing. Metal seals can be adapted to higher operating temperatures, and elastomeric seals have temperature-limited defects. The following are the same as the "
If a butterfly valve is required for flow control, it is important to select the correct valve size and type. Butterfly valve structure is particularly suitable for the production of large diameter valves. Butterfly valve not only in the oil, gas, chemicals, water treatment and other general industry is widely used, but also used in thermal power plant cooling water system. The following are the same as the "
Commonly used butterfly valve has a pair of butterfly valve and flange butterfly valve two. Wafer type butterfly valve is a double-headed bolt to connect the valve between the two pipe flanges, flange valve is a flange on the valve, with both ends of the valve flange bolts connected to the pipeline flange. The following are the same as the "
Butterfly valve is used with the stem to turn the circular butterfly plate for the opening and closing parts to achieve the opening and closing operation of the valve. Butterfly valve is mainly used with a shut-off valve can also be designed to adjust or cut off and adjust the function of the current butterfly valve The use of the diameter of the pipeline more and more.
Ball valve is a circular hole with a circular hole for the opening and closing parts, the ball with the stem rotation, in order to achieve the opening and closing operation of the valve.
The ball valve is evolved from the plug valve. It has the same rotation of 90 degrees to mention the action, the difference is that the plug body is a sphere, with a circular through hole or passage through its axis. The proportion of the spherical and the channel should be such that when the ball rotates 90 degrees, the inlet and outlet should all be spherical, thus breaking the flow. The following are the same as the "
The ball valve only need to rotate 90 degrees of operation and a small turning torque can be closed tight. The fully equal body cavity provides a very small, straight passage for the medium. It is generally believed that the ball valve is most suitable for direct opening and closing use, but the recent development of the ball valve has been designed so that it has a throttle and control the flow of use. The main features of the ball valve itself is compact, easy to operate and repair, suitable for water, solvents, acids and natural gas and other general working medium, but also for poor working conditions such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be the whole, it can be modular. The following are the same as the "
The throttle valve is controlled by changing the flow path to control the pressure and flow of the fluid. It is a regulating valve, but it can not be used instead of the regulating valve because of its structural limitation. In addition to the valve and the relevant part of the valve, are the same with the cut valve. Throttle valve opening and closing parts are mostly conical streamlined.
The check valve is a valve that automatically prevents the fluid from flowing backwards, and the valve plate of the check valve opens under the action of the fluid pressure, and the fluid flows from the inlet side to the outlet side. When the inlet side pressure is lower than the outlet side, Its own gravity and other factors automatically shut down to prevent fluid backflow.
Check Valve This type of valve is used only to allow the media to flow in one direction, and to prevent the direction of flow. Usually the valve is automatically working, in a direction of fluid pressure, the valve flap open; the reverse flow of fluid by the fluid pressure and the valve flap valve self-acting on the seat, which cut off the flow. Which check valve belongs to this type of valve. The following are the same as the "
Press to prevent the media back to use the valve, which includes a swivel check valve and a lift check valve. Swing check valve has a hinge mechanism, as well as a door like the valve flap free to lean against the inclined seat surface. In order to ensure that the valve flap can reach the seat surface each time the appropriate position, the valve flap design in the hinge so that the valve flap has enough space to open space, and the valve real, full contact with the valve seat. The valve flap can be made entirely of metal, or it can be covered with leather, rubber, or a synthetic cover, depending on the performance requirements. Swing check valve in the fully open condition, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. Lift check valve valve seat is located on the valve seat sealing surface. The valve in addition to the valve can be free to lift, the rest of the same as the cut-off valve, the fluid pressure from the valve seat sealing surface lift up, the media return valve leading to the valve seat down and cut off the flow. Depending on the conditions of use, the valve flap may be of the all-metal construction, or may be in the form of a rubber pad or rubber ring embedded in the valve disc holder. Like the cut-off valve, the passage of fluid through the lift check valve is narrow, so the pressure drop through the lift check valve swing larger than the swing check valve, and the flow of swing check valve is limited Very little. The following are the same as the "
Diaphragm valve is a special form of shut-off valve, the opening and closing pieces is made of a soft material with the diaphragm, which will valve body cavity and the valve cover cavity separated.
Plug the valve
The plug valve is a plug with a hole as the opening and closing parts, the plug body with the stem rotation, in order to achieve the opening and closing the action of the valve plug plug body for the cone, there are cylinders, plug valve structure is simple, Rapid, fluid resistance is small. Plug valve is usually used for the pressure is not high, the caliber is not the occasion. Plug valve used to cut off the media flow, but also for media distribution, three-way plug valve and four-way plug valve is used to change the media flow Direction or media distribution.
The safety valve is used as an overpressure protection device such as a boiler, a pressure vessel, etc. When the medium pressure in the protected equipment is abnormally raised to a specified value, the valve is automatically opened and the total amount is discharged to prevent the pressure from rising When the pressure is reduced to another specified value, it is automatically turned off.
Pressure reducing valve
The pressure reducing valve is a kind of regulating valve which reduces the inlet pressure to a certain outlet pressure through the opening and closing parts and can keep the outlet pressure by the energy of the medium itself when the inlet pressure and flow rate change Basically the same valve
Traps are used in steam pipe and equipment, can automatically discharge condensate, air and other non-condensable gas, and water vapor leakage valve.
Emergency shut-off valve
Emergency shut-off valve is developed in recent years, new products. In the application of the project is increasing. The following are the same as the "
We all know that the fire pipe network and life has always been two water supply system, respectively, by the two pumps were water supply, from the pump to the building a long distance from the two-way pipeline water supply. This is due to the laying of two-way pipeline construction workload is larger, more than twice the pipeline material, and maintenance of a pipe to identify a lot of inconvenience; fire pipe for many years do not use, easy to rust, wall and interface due to corrosion thinning , Usually without pressure, and in the event of a fire, the pipeline suddenly increased pressure, easy to burst, resulting in the fire system can not water. City construction to promote the pump directly from the municipal pipe network pumping, no longer set up underground pool. This eliminates the cost of building the pool, while avoiding the secondary pollution of the water. To keep the water clean, to ensure the health of the people This is the most important one. Because of these advantages, so this product is gradually being welcomed by everyone. The following are the same as the "
The emergency shut-off valve is one of the hydraulic control valves. Is composed of main valve, throttle valve, pilot valve, pressure gauge and take over other pipe fittings. When the main valve inlet pressure is lower than the pressure set by the pilot valve, the pilot valve at this time in the open state, the main valve on the lid chamber pressure and the main valve outlet pressure equal to the import and export pressure, water flow through the outlet The When the fire pump starts, or the inverter pump pressure increases, beyond the pilot valve set pressure, the main valve inlet to the pilot valve control tube pressure increases, the role of the pressure on the spring, down pressure, driven spool Down, so that the pilot valve closed, then the main valve inlet pressure through the throttle valve constantly added to the main valve cover on the cavity, because the valve by the downward pressure is greater than the upward thrust, the main valve closed. Please note that the key point is that the inlet pressure is less than the set pressure the valve has been in the open state, the inlet pressure is greater than the set pressure, the valve is closed. The following are the same as the "
The electromagnetic valve
Solenoid valve is used to control the fluid of the basic components, are actuators; not limited to hydraulic, pneumatic. Solenoid valve used to control the direction of hydraulic flow, the factory machinery are generally controlled by the hydraulic steel, so it will use the solenoid valve. The following are the same as the "
Solenoid valve works, the solenoid valve has a closed cavity, in different locations open through the hole, each hole leads to a different tubing, the middle of the cavity is the valve, both sides are two electromagnets, which side of the magnet coil The valve body will be attracted to which side, by controlling the movement of the valve to stalls or leakage of different drainage holes, and the oil hole is normally open, the hydraulic oil will enter a different drain pipe, and then through Oil pressure to promote the oil just the piston, the piston and drive the piston rod, piston rod drive mechanical device moving. This controls the mechanical movement by controlling the current of the electromagnet.