WHAT IS A PULSE VALVE? WHAT ARE THE TYPES?
TORK Power Pulse Solenoid Valves also work like other two-way solenoid valves. However, the inlet and outlet connections form a 90-degree angle. For this reason, it has the feature of sending the air in the form of a blow (shock). For this reason, it is known as air shock (pulse valves). Only when energized, does it turns on normally and gives the compressed air pulse in the form of a pulse for a very short time. The permeability is not continuous in the form of a pulse, even if energization is continued. For this reason, it is operated by giving energy for a short time and at certain intervals.
Other 2-way solenoid valves pass the fluid at the same flow rate. The pulse valve gives the air in a very short time in the form of a high blow, or shock. Permanently impervious.
Solenoid valves are used in all kinds of clean liquid fluids. Pulse valves, on the other hand, only use compressed air. Therefore, a both-way solenoid valve cannot be used instead of a Pulse Valve.
Pulse Solenoid Valves are generally used in cement, ceramics, paint, feed thermal power plants, concrete plants, detergent, glass, and iron and steel industry to shake off the dust accumulated in jet filters (bag filters) or to prevent the solidification of the dust accumulated in the bunkers.
Pulse Valve Types:
- Threaded Pulse Valves
- Union Connected Pulse Valves
- Pulse valves with flanged connection
- Hose-connected Pulse Valves
- Pulse Solenoid Valves controlled by remote control Valve box.
- Pulse Tank (Air Tank) Mounted Pulse Solenoid Valves.
APPLICATION METHODS OF PULSE SOLENOID VALVES:
TORK PULSE SOLENOID VALVES are connected to the mounting location in two ways;
- On the coil part
- It is connected by separating the coil part and the body.
If the pulse solenoid valves are connected to the dust filter system mounted on the coil body, it takes the control from the time relay, and the time relay takes the control from the differential pressure relay and controls the system.
In case the TORK PULSE SOLENOID VALVE is assembled into two parts, the first part is the valve body and the second part is the coiled part that controls the valve body. Assemblies made by separating the coil part from the body are rather to better protect the coil against water, dust or any fluid. In such installations, the electrical connection is mounted further away from the valve body. Coils are placed in an aluminum box. Pulse valves with remote control system are coilless types. In addition, the time relay controls the solenoid valves in the remote control box.
Here, the air control box is connected to the control inlet via the hose coming out of the 1/4" two-way solenoid valves in the TORK C96 Series, and the compressed air through the top cover of the pulse valve. In order for the pulse valve to function as a shocker, its control is provided by energizing the coil in the aluminum box.
PULSE SOLENOID VALVES are able to fulfill their shocking function by remaining in operation within a short period of time, such as milliseconds.
It is possible to control these valves with TORK PATLAÇ time relays. Time relays are manufactured with 4-8-12, 18-24 outputs, in a protective box, with adjustable burst time and waiting time interval.
WORKING PRINCIPLES OF PULSE SOLENOID VALVES
Pulse Solenoid valves are manufactured with single diaphragm or double diaphragm. Solenoid valves with connection sizes such as 3/4" and 1" are single diaphragm. Solenoid valves with large connection sizes such as 1 1/2", 2" are single diaphragm or double diaphragm. Double diaphragm valves are advantageous in terms of operation compared to single diaphragm valves.
ADVANTAGES OF DOUBLE DIAPHRAGM VALVES:
- Air makes shocking more severe.
- It affects more bags. (like 40%)
- Energy is given at longer intervals and shocking is done.
- Diaphragms last longer.
- Energy consumption is reduced by saving compressor air.
Since Pulse Solenoid valves are diaphragm valves, they cannot perform the on-off function (even though the coils are energized) without the necessary pressure difference, like other diaphragm solenoid valves. Pressure applied to the inlet of the solenoid valve min. It should be 0.5 kg/cm2.
In this case, when the coils of the diaphragm solenoid valves are energized, it is necessary to be able to open and close. Compressed air at the inlet of the solenoid valve pressurizes the diaphragm of the normally closed valve from below. The entire lower surface of the exposed diaphragm is equally affected by this pressure. This compressed air also passes to the upper surface of the valve diaphragm through a 1-2 mm diameter hole on the diaphragm. It also exerts pressure on this surface. The lower part of the diaphragm of the solenoid valve, the upper part, the lower part of the solenoid valve cover, is completely filled with compressed air and remains trapped here. On the top cover of the solenoid valve, there is a coil, a sleeve and a core that provides the control of the valve. With the pressure of the spring on the core inside the hive, the trapped air also clogs the discharge path.
When the coil of the solenoid valve is energized, the core inside the sleeve becomes magnetized and overcomes the force of the spring and moves upwards, venting the trapped air on the valve diaphragm to the outside. Meanwhile, the compressed air under the diaphragm cannot rise above the diaphragm and regain the pressure balance in a short time. Due to this pressure imbalance, the diaphragm moves up and the valve comes to the open position. This is how shocking happens.
With a double diaphragm solenoid valve, this happens twice. The small diaphragm air at the top is evacuated first. In this case, the small diaphragm vents the large diaphragm. In this way, differential pressure is created more quickly and the shock is twice as severe.
Pulse valves are normally closed valves and become normally open when shocking occurs. Shocking takes place by giving energy for 50-120 milliseconds. The shocking interval is set by the operator.
Pulse tanks are package systems developed for faster and more efficient connection of pulse valves to bag filter bunkers.
As seen on the side, in a dust bag bunker system, Pulse valve feeds from the air collector and sends compressed air to the bag filters placed in the bunker by means of a time relay, and it is observed that the dust accumulated on the outer surface of the bags, which is constantly shaken with compressed air, is poured into the dust collection chamber under the buncarin.