Four characteristics and safe operation of the hot

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Four features and safe operation of solenoid valve products

I. safety: failure to pay attention to safety will lead to disaster

1. Corrosive medium: Plastic King solenoid valve and all stainless steel should be selected; For strongly corrosive media, the isolating diaphragm type must be selected. Example cd-f.z3cf. For neutral medium, the solenoid valve with copper alloy as the valve shell material should also be selected. Otherwise, rust chips often fall off in the valve shell, especially in the case of infrequent action. Ammonia valves shall not be made of copper

2. Explosive environment: products of corresponding explosion-proof grade must be selected. Waterproof and dustproof varieties shall be selected for outdoor installation or dust-proof occasions

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

II. Applicability: not applicable means spending money on things and adding trouble

1. Medium characteristics

1.1 different types of solenoid valves shall be selected for gas, liquid or mixed state, Example Z "except that some large equipment can recover qdf for air, zqdf-y for liquid, zqdf-2 (or -3) It is used for steam, otherwise it is easy to cause malfunction. ZDF series multi-function solenoid valve can be connected to air Liquid. It is best to specify the media status when setting, so that the installation user does not have to adjust it

1.2 if the medium temperature is different from that of products of different specifications, otherwise the coil will burn out and the seal will be aged, which will seriously affect the service life

1.3 medium viscosity, usually at 50cst, the whole mountain city is filled with hope and vitality. If the diameter exceeds 15mm, ZDF series multi-function solenoid valve shall be used for special order. High viscosity solenoid valve with diameter less than 15mm

1.4 when the medium cleanliness is not high, the backwash filter valve should be installed in front of the solenoid valve. When the pressure is low, the direct machining process moving diaphragm solenoid valve can be used, such as cd-p

1.5 if the medium is in directional flow, and it is not allowed to reverse flow, zdf-n and zqdf-n only need two-way flow, please put forward special requirements

1.6 the medium temperature shall be within the allowable range of the solenoid valve

2. Pipeline parameters

2.1 select the valve port and model according to the requirements of medium flow direction and pipeline connection mode. For example, for switching from one pipe to two pipes, select Ca5 and Z3F for small diameter and zdf-z1/2 for medium or large diameter. For another example, to control the confluence of two pipelines, please select zdf-z2/1, etc

2.2 the nominal diameter is selected according to the flow and Kv value of the valve, which can also be the same as the pipe inner diameter. Please note that some manufacturers are not marked with Kv value, and the valve hole size is often smaller than the interface pipe diameter, so we must not delay things due to low prices

2.3 working differential pressure

indirect pilot type can be selected if the minimum working differential pressure is above 0.04MPa; If the minimum working pressure difference is close to or less than zero, the direct acting type or step-by-step direct type must be selected

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