Double flap check valve advantages

A. short structure, small size, light weight, for the valve installation, handling, storage and pipeline layout to bring great convenience,
And can save costs.
B. Reduced line vibration, in order to minimize the line vibration or eliminate line vibration, the flow must have the opportunity to countercurrent as soon as possible before closing the pneumatic solenoid water valves.
Both flap check valves each have only a full structure to check the size of the valve flap one morning, and it is experienced by reducing the fluid resistance and can be more
Move quickly to the closed position. They have only half the radius of the conventional check valve. Its half distance from the open position to the leading position of the closed position,Thus reducing the travel time to 50%
C. Reduced water hammer, the whole structure of the swing pneumatic control components price contrast, double flap-type flap valve has been greatly reduced the weight, it can slam the
Water hammer phenomenon to a minimum.

Electric valve operation principle

The high-quality standard air cylinders is used to adjust the medium flow, pressure and hydraulic. According to the adjustment part of the signal, automatic control valve opening, so as to achieve the media flow, pressure and hydraulic adjustment. JELPC Automation Components sub-electric control valve, pneumatic control valve and hydraulic control valve. Control valve by the electric actuator or pneumatic actuator and control valve composed of two parts. The electric control valve is usually divided into two types: single-seat type regulating valve and straight-through two-seat regulating valve. The latter has the characteristics of large circulation capacity, unbalanced operation and stable operation, so it is usually especially suitable for large flow, Leak less occasion.
    The flow capacity Cv is one of the main parameters of the selection of the Japan Series Cylinder. The circulation capacity of the control valve is defined as: when the pressure of the valve is 0.1MPa and the fluid density is 1g / cm3, The flow rate of the diameter control valve, known as the flow capacity, also known as the flow coefficient, expressed in Cv, the unit is t / h, the liquid Cv value calculated by the following formula.

Principle and setting of safety valve

The steam solenoid valves is a safety device that prevents the pressure device and the container from causing the pressure to rise or the pressure inside the container exceeds the limit. Safety valves are pressure vessels, boilers, pressure pipes and other pressure systems using a wide range of safety devices to ensure the safe operation of the pressure system.
When the container pressure exceeds the design requirements, the safety valve automatically open, exhaust gas reduction device over the high pressure to prevent damage to the container or pipeline. And when the pressure inside the container down to normal operating pressure, that is automatically closed to avoid the container overpressure to discharge all the gas, resulting in waste and production disruption.
air flow control valves mainly by the valve seat, valve (valve core) and loading mechanism of three parts. Some of the valve seat and the valve body is a whole, and the valve body is assembled together, it is connected with the device. The valve flap is often accompanied by a stem, which is fastened to the valve seat. The above valve is the loading mechanism, the size of the load can be adjusted. When the pressure inside the device within a certain working pressure range, the internal medium on the valve above the force is less than the loading mechanism attached to the valve above the force, the difference between the valve and the valve seat between the sealing force, So that the valve discs pressed the valve seat, the equipment can not be discharged media. When the pressure inside the device exceeds the specified working pressure and reaches the opening pressure of the safety valve, the force exerted by the inner medium on the flapper is greater than the force exerted on it by the loading mechanism, so that the valve flap leaves the valve seat, the safety valve opens, The medium is discharged through the valve seat, if the safety valve displacement is greater than the safety of the equipment discharge, the equipment pressure is gradually decreased, and through a short period of time after the exhaust, the pressure is back to normal working pressure. At this point the internal pressure on the valve above the force is less than the loading mechanism applied to it above the force, the valve plate and pressed the valve seat, the media stopped discharging, the equipment to maintain normal working pressure to continue to run. Therefore, the safety valve is through the valve on the media force and load mechanism of the force of the length of their own closed or open to achieve the purpose of preventing overpressure equipment.

Product technology into the constraints of China's valve product development

Prospective Industry Research Institute data pointed out that in recent years, China's rapid development of the valve industry, raw materials and labor costs and other factors. Product exports and market share continues to expand, and gradually become the industry's important production base and the main product sales market. China's control valve factory many enterprises, small-scale, the lack of core competitiveness, and low concentration of enterprises, difficult to influence in the international market, to a large extent restricted the healthy development of the direct acting solenoid valves manufacturers china industry.
It is understood that although a number of township enterprises to develop rapidly, but because the township enterprises starting low, technical strength is very weak, poor equipment, most of the products are imitated production, especially for the drainage of low-pressure valve problem is serious but the above problems do not affect China 's future prospects of the valve industry.
This is mainly due to the support of national policy and the strong demand of the valve product market, especially in the past few years, the West-East Gas Pipeline Project, West to East, South-North Water Transfer Project requires a large number of valve products. Low profit Last year, China's valve industry import and export volume reached 24.1 billion US dollars, an increase of 28.2%, of which exports amounted to 22.4 billion US dollars, up 29.3%; total imports of 20.134 billion US dollars, an increase of 27% But also because of the high-end technology and foreign manufacturers still exist compared to the larger gap, the next period of time, product technology will become a bottleneck restricting the development of China's valve products.
Until recently, pneumatic control components suppliers were also limited to some less profitable target markets such as Ethiopia, Sudan, Iran, Iraq and some Southeast Asian markets. The small size of these markets, the decision-making process depends entirely on the price, profit margins are limited.
China's import valve manufacturers must pay attention to the fact that if they want to survive in the future, they must improve the performance of the previous downturn, access to large export manufacturing profits. At present, the main reason for the small export income is that there are a lot of business opportunities in China's domestic market, and the quality of equipment imported from China's imported valves is not enough to sell overseas.

Set the safety valve should pay attention to the following points:

(1) the container with gas, liquid two-phase material when the safety valve should be installed in the gas phase.
(2) When the shut off solenoid valve is used to vent the flammable liquid, the outlet of the safety valve should be connected with the accident tank. When the material is high temperature combustible material, the receiving container should have the appropriate protective equipment.
(3) the general safety valve can be vented on the ground, venting should be more than 1 meter above the operator and should not be toward 15 meters within the open fire location, sparks and high temperature sprinkler equipment. Indoor equipment, container pneumatic solenoid valve vent should be led out of the roof, and more than 2 meters above the roof.
(4) When the safety valve inlet has a blocking valve, the blocking valve should be in the normally open state, and to be sealed, so as to avoid mistakes.

high temperature solenoid valve refers to the closure (disc or butterfly plate) for the disc, around the valve shaft rotation to achieve the opening and closing of a valve, mainly in the pipeline from the cut and throttling. Butterfly valve opening and closing parts is a disc-shaped disc, in the valve body around its own axis of rotation, so as to achieve the purpose of opening or closing or adjustment. Butterfly valve fully open to the whole is usually less than 90 °, butterfly valve and butterfly rod itself does not have self-locking ability, in order to butterfly plate positioning, to install the worm on the stem reducer. The use of worm reducer, not only can make the disc with self-locking ability, so that the butterfly plate to stop at any position, but also improve the valve operating performance.
The characteristics of the special three way solenoid valves can be high temperature, the pressure range is also applicable, the valve nominal diameter, the valve body made of carbon steel, valve plate sealing ring with metal ring instead of rubber ring. Large-scale high-temperature butterfly valve made of steel welding, mainly used for high-temperature media, smoke duct and gas pipeline.

precision flow control valve is the pipeline medium pressure as the driving force, the opening and closing, regulating the valve. It consists of a main valve and attached pipe, needle valve, ball valve and pressure gauge and other components, according to the purpose of use, different functional sites, can be transformed into remote control float valve, pressure reducing valve, slow closing check valve, flow control valve , Pressure relief valve, hydraulic electric control valve, emergency shut-off valve. The pilot valve with the media level and pressure changes and action, due to a large number of pilot valves, can be used alone or in several combinations, you can make the main valve to the water level and water pressure and flow, etc. to separate and complex adjustment function The But the main valve body similar to the valve, the valve is fully open, the pressure loss is much larger than other valves, and the opening degree of each loss coefficient is close to the closed state, the more the surge, the greater the diameter of the valve Significantly. With the above characteristics of the valve, in the action near the valve to accelerate, prone to the impact of water hammer, close to the full closure, the valve moves the more slowly the better, so the valve can be set on the throttle device. In addition the pilot valve throttle and action part to try to avoid the installation of small diameter openings, so as not to plug. If necessary, add filters, regular maintenance and set the bypass pipe. industrial automation and control valve diaphragm type and piston type two, the same principle, are above the downstream pressure difference as the driving force, a pilot valve control, so that the diaphragm (piston) hydraulic differential operation, completely by the hydraulic automatic adjustment, so that the main The valve flap is fully open or fully closed or in a regulated state. When the pressure water in the control chamber above the diaphragm (piston) is discharged to the atmosphere or downstream low pressure zone, the pressure value acting on the lower part of the valve flap and below the diaphragm is greater than the above pressure value, thereby pushing the main valve valve Open position: When the pressure inside the control chamber above the diaphragm (piston) is in the middle of the inlet pressure and the outlet, the main valve disc is in the regulated state and its adjustment position depends on the combination of the needle valve and the pilot valve in the conduit system Control effect. The pilot valve can open or close its own small valve port by changing the downstream pressure, thus changing the pressure value of the control room above the diaphragm (piston) and controlling the adjustment position of the main valve disc. Can be used for living water supply, fire protection systems and industrial water supply systems.