First, security: pay attention to safety will lead to disaster 1 corrosive media: the king should use plastic and stainless steel solenoid Gas valve supplier; strong corrosive media for isolating diaphragm must be used. Patients with CD-F. Z3CF. Neutral medium, but also should use copper alloy for the valve housing materials, electromagnetic valve, otherwise the valve shell debris often rust off, especially where the action is not frequent. Ammonia can not be used with copper valve.

2 explosive environments: the product must use the appropriate level of proof, open-air installation or dust should be used in many occasions, waterproof, dust-proof varieties.

3 solenoid valve should be more than Nominal maximum working pressure of the pipe.

Second, applicability: not applicable fee equal pay for things, but also trouble

1 medium properties

1.1 quality of gas, liquid or mixed states, which use different varieties of solenoid valves, for example ZQDF for air, ZQDF-Y for liquid, ZQDF-2 (or -3) for steam, or easily cause malfunction. ZDF series multi-function solenoid valve may be all in the gas, liquid. When told that the media provide the best state of the installation the user will not have to re-tuning.

1.2 medium temperature products with different specifications, otherwise the coil will burn, seals aging, seriously affect the life of life.

1.3 medium viscosity, usually 50cSt below. If more than this value, diameter greater than 15mm solenoid valve with ZDF series multi-function for special orders. Diameter less than 15mm solenoid valve provides a high viscosity.

1.4 media cleanliness is not high before the solenoid valve should be fitted with recoil filter valve, low pressure style can be used direct-acting solenoid valve diaphragm for example, CD-P.

1.5 If the directional flow of media, and are not allowed back in ZDF-N and ZQDF-N single two-way flow required, please make a special request.

1.6 medium temperature should be chosen in the solenoid valve allows the range.

2 Pipe Parameters

2.1 According to the media flow requirements and pipe connection valve openings and model selection. For example, two pipes for a pipeline to the switch, the small diameter of the election CA5 and Z3F, medium or large diameter select ZDF-Z1 / 2. Another example is the convergence of the two pipelines controls, select ZDF-Z2 / 1 and so on.

2.2 In accordance with the value of the selected flow rate and Bbq Gas Valves Kv DN, also available with pipe diameter. Please note that some manufacturers are not marked with Kv values, often less than the interface valve hole size diameter, must not seek the lowest and the villain.

Working pressure 2.3

Minimum working pressure is used in more than 0.04Mpa indirect Pilot; minimum working pressure must be close to or less than zero, or use direct-acting direct-type step.

3 environmental conditions

3.1 environment, the maximum and minimum temperature should be chosen within the allowable range, if tolerance to be made for special order.

3.2 environment with high relative humidity and rain water droplets and other occasions, water solenoid valve should be selected.

3.3 environment, constant vibrations, bumps and shock should be selected where special varieties, such as marine solenoid valve.

3.4 in a corrosive or explosive environments should be given priority in the use of security requirements based on use corrosion-resistant hair.

3.5 If the restricted environment of space, please use the multi-function valve, because it eliminates the need for bypass and three manual valves and easy online maintenance.

4 power supply conditions

4.1 According to the type of power supply, AC and DC were selected solenoid valve. Generally speaking, easy access to AC power.

4.2 voltage specification as preferred AC220V.DC24V with

4.3 AC power supply voltage fluctuations are usually selected +% 10% .- 15%, DC to allow ±% 10 or so, should the ultra-poor, regulators should take measures or make a special order request.

4.4 should be selected according to the rated power capacity of current and power consumption. VA should be noted that the exchange value of starting high, lack of capacity should be preferred in the indirect conduction-type solenoid valve.

5 control accuracy

Only 5.1 ordinary solenoid valve opening and closing two locations, in the control parameters requires high precision and smooth when you use a number of solenoid valves; Z3CF three normally open solenoid valve, with a low lift, fully open and close the three kinds of traffic; ZDF -Z1 / 1 combination of multi-function valve with full, wide open, small open, full four traffic.

5.2 Operating time: refers to the signal on or off the main valve moves to the completion time, only the company's patented multi-function solenoid valve for opening and closing times were adjusted not only to meet the control precision, but also to prevent water hammer damage.

5.3 Leakage: Leakage is given on the amount of sample values ??for common economic level, if too high, please make a special order.

Third, the reliability: unreliable would undermine the entire system

1, working life, this factory is not included in the pilot project, is the type of pilot projects. To ensure the quality brand-name manufacturers should choose regular.

2, the working standard: sub-system of long-term, repeated short-term and short-term work system work system three. The company's products are long-term conventional system, which allows long-term power coil work. For a long time only a short-term closure of the valve opening of the case, are advised to use normally open solenoid valve. Short-time work system used in large quantities when they can be used as a special order to reduce power consumption.

3, the operating frequency: high frequency requirements of the action, the structure should be optimized direct-acting solenoid valves, power preferred to listen to the exchange.

4, operating reliability

Strictly speaking the pilot solenoid valve has not been formally included in our professional standards, to ensure quality brand-name manufacturers to be elected regular. Some occasions the number of operations is not much, but the very high reliability requirements, such as fire, emergency protection, must not be taken lightly. Particularly important, should be taken once every two double insurance.

Fourth, the economy: the economy is not on the money, waste of energy and life

It selects one of the scale, but must be safe, suitable, reliable, based on the economy.

Economy is not only the price of the product, but also to give priority to their function and quality of installation and maintenance, and other accessories required for the costs.

More importantly, a solenoid valve in the automatic control system in automatic control systems as well as the entire share of the cost of production is minimal, if any cheap and wrong choice early damage group is enormous.

In short, the economy not just the product price, product performance and low cost but comprehensive cost price.