Steam solenoid valve use and characteristics and troubleshooting instructions

1. The steam solenoid valve is a step-by-step direct pilot type solenoid valve, which can be divided into a normally closed steam solenoid valve and a normally open steam solenoid valve according to the different opening and closing conditions at the time of power failure.

Normally closed steam solenoid valve, after the coil is energized, the armature first lifts the auxiliary valve plug under the electromagnetic force, and the fluid on the main valve cup flows away through the auxiliary valve, reducing the pressure on the main valve cup, when the main When the pressure on the valve cup is reduced to a certain value, the armature mobilizes the main valve cup and uses the pressure difference to open the main valve cup and the medium passes. After the coil is de-energized, the electromagnetic force disappears and the armature is reset by its own weight. And relying on the medium pressure, the main and auxiliary valves can be carefully closed.

Normally open steam solenoid valve, after the coil is energized, because of the suction force, the moving iron core moves down, the auxiliary valve plug is pressed down, the auxiliary valve is closed, the pressure in the main valve valve cup rises, and when the pressure rises to a certain value, the main valve The pressure difference between the upper and lower cups is the same, because the electromagnetic force is used, the moving iron core falls under the main valve valve cup, the main valve seat is pressed, and the valve is closed. When the coil is de-energized, the electromagnetic attraction is zero, the valve plug and the iron core of the auxiliary valve are lifted upward due to the spring use, the auxiliary valve is opened, and the fluid on the main valve valve cup flows away through the auxiliary valve, reducing the use on the main valve valve cup. The pressure, when the pressure on the main valve cup is reduced to a certain value, the main valve cup is pushed up by the pressure difference, the main valve is opened, and the medium passes. How steam solenoids work

Second, the use and characteristics of steam solenoid valve

Use of steam solenoid valve

The steam solenoid valve is suitable for actuators that use steam as a heating medium for automatic temperature control. It can carry out two-position automatic control and remote control zone for boiler steam pipes of steam heaters, radiators, dryers and other steam equipments and various types of temperature automatic control instruments, steam setting machines, steam dyeing machines, steam resurgence machines and other complete sets of equipment. Widely used in dyeing, textile, printing and dyeing, food, medicine, cigarettes, cement products, petrochemical, metallurgical and other departments of the automatic control system.

Main features of steam solenoid valve

1. Abrasion resistance: reasonable material selection, the valve cup and the guide sleeve skillfully utilize the lubrication of the fluid to reduce wear

2. Resistance to condensation: The condensate of the steam pipe is an important factor affecting the operation of the steam solenoid valve. The valve is not affected by the condensed water.

3. Heat resistance: The electromagnetic parts and seal parts are made of special temperature-resistant electrical materials and sealing materials, and various insulation measures are applied.

Third, the steam solenoid valve installation notes are as follows:

1. When installing, please pay attention to the arrow on the valve body should be consistent with the flow direction of the medium. Do not install in places where there is direct dripping or splashing. The solenoid valve should be installed horizontally.

2. The solenoid valve should ensure normal operation within the fluctuation range of 15%-10% of the rated voltage of the power supply.

3. When the maximum pressure difference of the working pressure difference pipeline is less than 0.04MPA, the straight-type solenoid valve such as HOPE62, HOPE63, HOPE67, HOPE91 and the step-by-step direct-acting solenoid valve should be used. When the minimum working pressure difference is greater than 0.04MPA, the pilot type can be used. (Pressure differential type) solenoid valve, the highest working pressure difference should be less than the maximum calibration pressure of the solenoid valve. Generally, the solenoid valve is working in one direction, so pay attention to whether there is a back pressure difference. If yes, please install a check valve.

4. The voltage of the solenoid valve during normal operation is AC220±10%V. If it exceeds this range, please indicate the voltage fluctuation when ordering. Other specifications of the power supply voltage can be made for special order.

5, the solenoid valve is divided into two types: normally closed and normally open; generally use normally closed type, power on, power off; but when the opening time is very long, the closing time is very short, please use the normally open solenoid valve.

Fourth, the cause of the failure of the steam solenoid valve can not be opened and its treatment

The steam solenoid valve is a kind of product widely used in the series of solenoid valves. The environment and medium for its application are steam. The steam solenoid valve is divided into two types, one is the boiler steam solenoid valve, and the other is the thermal power plant. Steam solenoid valve. The two steam solenoid valve products are adapted to different media. The user should select according to the actual working environment requirements and the model performance of the steam solenoid valve. In the actual use of steam solenoid valve products, we often encounter some urgent fault problems. How can we solve them? The details are as follows:

1. If the opening pressure is too high or too small, the steam solenoid valve will not work, and it can be repaired and replaced according to the situation.

2. The poor sealing of the steam solenoid valve itself will also cause the solenoid valve to be inoperable. At this time, it is necessary to see if there is any leaking place for repair.

3. The spring on the inner valve core of the steam solenoid valve is stuck. If the card does not move, the solenoid valve can't work. Another possibility is that the moving iron core and the pipe are too tight. When it is opened, the iron core is stuck.

4. First check if the coil is burnt out. If it is, remove the steam solenoid valve to check and repair or replace the new steam solenoid coil according to the damage degree of the coil.

5. Check if the spring of the steam solenoid valve is broken, and replace or repair it according to the situation.

6. If there are particulate impurities in the steam solenoid valve, it will hinder the internal action of the steam solenoid valve and affect the operation of the valve. The steam solenoid valve can be disassembled for cleaning work.