SMS TORK
Pulse valves are generally used in cement, ceramics, paint, feed thermal power plants, concrete plants, detergents, glass and iron and steel industry in order to prevent the dust accumulation in the jet filters (bag filter) or the dust accumulation in the bunkers.
Operation Way
TORK pulse valves operate like other two-way solenoid valves. However, the input and output connections form a 90 degree angle. Therefore, it has the ability to send air in the form of a pulse. Therefore, it is known by the name of air pulse valves. It only switches to normally open when it energized, and gives the compressed air stroke in a very short time. Even if energy is continued, the permeability is not continuous in the form of a pulse. For this reason, it is operated with short-time and periodic energy. The other 2-way solenoid valves pass the continuous fluid to the same flow rate. The pulse valve gives the air in the form of a high pulse, shocking in a very short time. It’s not permanent.
Solenoid valves are used in all types of clean liquid fluids. Pulse valves are only used in compressed air. Therefore, the two-way solenoid valve cannot be used to replace of pulse valve.
Pulse Valve Types:
- Gear Connection Pulse Valves
- Relief Connection Pulse Valves
- Flanged Connection Pulse valves
- Hose Connection Pulse Valves
- Remote Control Valve box Controlled Pulse Valves
- Pulse Tank (Air Tank) Mounted Pulse Solenoid Valves
Application of Pulse Valves
TORK pulse valves are connected to the installation location in two ways;
1) On the coil part
2) Separating the body with coil part
If the pulse valves connected to the dust filter system with coil mounted on the body, the control valve receives the control from the time relay. The time relay also controls the system by taking the control from the differential pressure relay.
In the case of installation by dividing the pulse valves into two parts, the first part is the valve body and the second part is the coil section that controls the valve body. Mounting of the coil part from the body; rather it is better to protect the coil against water, dust or any other fluids. In such assemblies, the electrical connection is mounted in a location farther away from the valve body. The coils are placed in an aluminum box. The remote control system is applied without a coil. The timer also controls the solenoid valves where in the remote control box. Here the air control box TORK C96 is connected to the control input via the top cover of the compressed air explosion valve with the hose coming out of the 1/4 “two-way solenoid valve. The control is provided by energizing the coil in the aluminum box so that the valve body can perform the shock function of the body. It can perform the shock function in a short period of time, such as milliseconds.
It is possible to control pulse valves with time relays. The time relays are manufactured in 4-8-12, 18-24 units output, in a protective box, with adjustable pulse duration and waiting time interval.
Working Principles of Pulse Valves
The pulse valves are manufactured as single diaphragm or double diaphragm. 3/4 “and 1” connection sizes are single diaphragm valves. 1 1/2 “, 2” large connection sizes are single diaphragm or double diaphragm. Double diaphragm valves are advantageous compared to single-diaphragm valves.
Advantages of Double Diaphragm Valves:
- Air shock is more severe.
- It affects more bags. (40%)
- Energized and shocked at longer intervals.
- Diaphragms will last longer.
- Energy consumption is reduced by saving compressor air.
Since the pulse valves are diaphragm valves, like the other diaphragm valves, they cannot perform the switch-off function (although the coils are energized) without the required pressure difference. Pressure applied to the inlet of the solenoid valve should be min. 0.5 kg / cm2. In this case, when the coils of the diaphragm solenoid valves are energized, there is a condition for opening and closing. The compressed air at the inlet of the solenoid valve compresses the diaphragm of the normally closed valve. The bottom surface of the exposed diaphragm is all affected equally by this pressure. Through a 1-2 mm diameter hole on the diaphragm, this pressurized air passes to the upper surface of the valve diaphragm. It makes pressure on this surface. The lower part of the solenoid valve, the upper part of the diaphragm, the solenoid valve cover is filled with compressed air and remains in the trapped state. The solenoid valve has a coil, socket and core in it that controls the valve on the top cover. The spring on the core inside the socket also obstructs the evacuation path of the air trapped by the pressed force.
When the coil of the solenoid valve is energized, the core inside the socket defeats the spring force by magnetizing and moves upward, draining the trapped air on the valve diaphragm to the outside. In the meantime, the compressed air under the diaphragm cannot reach the diaphragm and re-establish the pressure balance in a short time. Due to this pressure imbalance, the diaphragm moves up and the valve is open. This is the way of the shocking situation.
With double diaphragm solenoid valve, this occurs twice. First, the small diaphragm air at the top will be evacuated. In this case, the small diaphragm bleeds the large diaphragm air. In this way, the differential pressure is created more quickly and the shock is twice as severe.
Pulse valves are normally closed valves and normally open when they perform the shocking event. 50-120 milliseconds of energy is applied for shocking. The range of shocking is set by the opera tor.