Introduction to the safety and applicability of solenoid valves

First, security: failure to pay attention to safety will cause disaster

1. Corrosive medium: Plastic King solenoid valve and all stainless steel should be used; for strong corrosive medium, isolation diaphragm type must be used. For neutral media, it is also advisable to use copper alloy as the solenoid valve of the valve shell material. Otherwise, the rust will often fall off in the valve casing, especially in occasions with infrequent movement. Ammonia valves cannot be made of copper.

2. Explosive environment: The corresponding explosion-proof grade products must be selected. For outdoor installation or dusty occasions, waterproof and dustproof varieties should be used.

3. The nominal pressure of the solenoid valve should exceed the maximum working pressure in the pipe.

Second, applicability: not applicable is equal to spending money to buy things, but also to add trouble

1. Media characteristics

1.1 Different types of solenoid valves are used in the gas, liquid or mixed state. For example, ZQDF is used for air, ZQDF-Y is used for liquid, ZQDF-2 (or -3) is used for steam, otherwise it may cause malfunction. ZDF series multi-function solenoid valve can pass through gas and liquid. It is best to specify the media status when ordering, and the installation user does not have to adjust.

1.2 The medium temperature is different in specifications, otherwise the coil will burn out and the seal will age, which will seriously affect the life expectancy.

1.3 medium viscosity, usually below 50 cSt. If this value is exceeded, the ZDF series multi-function solenoid valve is used for special order with a diameter greater than 15mm. A high viscosity solenoid valve with a diameter of less than 15 mm.

1.4 When the media cleanliness is not high, the backflush filter valve should be installed in front of the solenoid valve. The low pressure mode can be used as a CD-P for direct-acting diaphragm type solenoid valve.

1.5 If the medium is directional, and the backflow of ZDF-N and ZQDF-N is not allowed to flow in both directions, please make special requirements.

1.6 The medium temperature should be selected within the allowable range of the solenoid valve.

2. Pipeline parameters

2.1 Select the valve port and model according to the medium flow requirements and pipe connection. For example, for a pipe to switch to two pipes, choose CA5 and Z3F for small diameter, ZDF-Z1/2 for medium or large diameter. For example, if you want to control the convergence of two pipes, please choose ZDF-Z2/1.

2.2 According to the flow rate and valve Kv value, the nominal diameter is selected, and the inner diameter of the pipe can also be selected. Please note that some manufacturers do not have a Kv value, often the valve hole size is smaller than the interface diameter, and must not be greedy and low.

2.3 working pressure difference

The minimum working pressure difference above 0.04Mpa is optional indirect pilot type; the minimum working pressure difference is close to or less than zero, you must use direct-acting or step-by-step direct type.

3. Environmental conditions

3.1 The highest and lowest temperatures of the environment should be selected within the allowable range. If there is an out-of-tolerance, special orders should be made.

3.2 In the environment where the relative humidity is high and there are water droplets and rain, etc., the waterproof solenoid valve should be selected.

3.3 In the environment, there are often vibrations, bumps and impacts, etc. Special varieties should be selected, such as marine solenoid valves.

3.4 In corrosive or explosive environments, corrosion resistance should be preferred based on safety requirements.

3.5 If the environmental space is limited, please use the multi-function solenoid valve, because it eliminates the bypass and three manual valves and is convenient for online maintenance.

4. Power conditions

4.1 According to the type of power supply, AC and DC solenoid valves are used respectively. Generally, AC power is convenient to use.

4.2 For the voltage specification, use AC220V.DC24V as much as possible.