Firstly, we should consider four aspects when choosing this product: non-danger, reliability, applicability and economy.

1. Non-hazardous: corrosive medium: plastic wang solenoid valve and all stainless steel should be selected; The diaphragm type should be used for strongly corroded media. Neutral medium, should also choose copper alloy for the solenoid valve shell material, otherwise, often have rust dust off the valve shell, especially the occasion of infrequent action. Ammonia valve can not use copper. Explosion-proof grade products should be selected for explosive environment, waterproof and dustproof varieties should be selected for outdoor installation or dust in multiple occasions. Solenoid valve nominal pressure should exceed the tube working pressure.

2. Reliability: working life, which is not included in the factory test project, is a type test project. In order to ensure the quality of products from regular manufacturers. Work system: divided into long-term work system, repeated short work system and short work system three. For a long time to open the valve only a short time to close the case, it should be used normally open solenoid valve. Working frequency: when the operation frequency requirement is high, the structure should first choose the direct moving solenoid valve, and the power supply should first choose the ac. Operational reliability. Strictly speaking, this test has not been officially included in China's electromagnetic valve professional standards, in order to ensure the quality of the regular manufacturers of products. Some occasions of action is not much, but the reliability requirements are very high, such as fire protection, emergency protection, must not be taken lightly.

3. In terms of applicability, it depends on the characteristics of media. Different varieties of solenoid valves are selected for quality, gas, liquid or mixed state. Medium temperature products of different specifications, otherwise the coil will burn off, seal aging, seriously affect the life; Medium viscosity, usually below 50cSt. If the diameter is larger than 15mm, use multi-function electromagnetic pulse valve; When diameter is less than 15mm, use high viscosity solenoid valve. Medium cleanliness is not high should be installed in front of the electromagnetic pulse valve backwash filter valve, low pressure, can choose direct action diaphragm type electromagnetic valve; If the medium is directional flow, and do not allow backflow, two-way flow is required; Medium temperature should be selected within the allowable range of electromagnetic pulse valve.

4. Economy: one of the criteria it chooses, but only on the basis of applicability and reliability. Economy is not only the price of the product, but also the cost of installation, maintenance and other accessories. What's more, an electromagnetic pulse valve in the whole automatic control system in the whole automatic control system and even in the production line accounts for very little cost, if the wrong choice of petty gain caused by the damage group is huge.

Cooper