The principle of the opener of the non pressure boiler, the working principle of the opener in the a

Principle of opening and closing valve of non-pressure boiler] When the water pump in the boiler room is closed, the return water opening and closing valve of the gas hot water boiler is in a closed state. Stop the circulation of hot water in the pipes. When the water pump is opened, by increasing the water pressure in the upper cavity of the valve body, the sealing cover overcomes the spring force and moves down to open the valve port, so that the cold water in the pipeline flows back to the boiler for heating and circulation.

After the pump is opened, a pressure is given to the opening and closing valve switch, and then the opening and closing valve is opened, and the return pipe is opened.

Kick-off valves] are also known as backwater open-close valves, system open-close valves, or start-up and closers. Generally, according to the size of the water pipe diameter for modeling, it is best to choose the opening and closing valve with adjustable opening pressure, which is usually installed on the return pipe, and the control pipe of the opening and closing valve is connected between the outlet of the water pump and the check valve. The opening and closing valve must be equipped with a filter and decontamination device to ensure that the water inlet of the valve body is clean and free of debris.

The valve can be installed before the opening and closing valve to adjust the return water flow, the Yang Cheng of the circulating pump is larger, the system return water is consistent with the logo on the valve body, and the gate valve is set at both ends. In order to prevent waterproofing, a waterproof bypass pipe should be installed, first open the control valve of the water pump, drain the gas in the control pipe, and then open the water pump that has opened the control valve, and adjust the switch of the control valve to prevent the waterproof effect.

When the water pump is opened, the pressure signal is transmitted to the opening and closing valve through the pressure pipe, the valve is opened, and the water circulation is carried out. The water pump stops, the pressure decreases, the opening and closing valve closes slowly to prevent water hammer, and the opening and closing valve is closed instantaneously through the circulating pump to stop running, cutting off the water of the system to return to the gas hot water boiler, preventing the system water from overflowing from the expansion tank, causing the water in the system to flow back into the boiler.

The non-pressure boiler must use the opening and closing valve] because the non-pressure boiler is generally designed to have an open water tank or a vent pipe that often passes through the atmosphere, if the water flows back from the system to fill the boiler, the system water will all overflow from the boiler, and the boiler room can be flooded, so the position of the opening and closing valve in the non-pressure boiler system is very important.

The valve is connected to the system return pipe on the left and right. There is generally a four-point port on the valve, which must be connected to the outlet of the system circulating pump, and when the pump starts to generate pressure, the opening and closing valve is opened to ensure that the return pipeline is unblocked; When the pump is stopped, the pressure drops and the opening and closing valve closes to ensure that the water in the system does not flow backwards.

The working principle of the hoist in a hot water boiler.

1. The starter and closer is only used in the equipment of the atmospheric boiler system, in fact, it is a valve, and we often call it the system opening and closing valve.

2. What is the opening and closing valve used for?

The main purpose is to prevent the system water from flowing backwards into the boiler, because the atmospheric boiler is generally designed to have an open water tank or a vent pipe that often passes through the atmosphere, if the water flows back from the system to fill the boiler, the system water will all overflow from the boiler, and the boiler room can be flooded.

At the earliest, when there was no opening and closing valve design, as soon as the atmospheric boiler was stopped, the stoker had to immediately close the return valve to ensure that the water did not flow back. The opening and closing valve solves the problem.

In the natural circulation of hot water boiler, the inlet and outlet water are taken over from the top of the upper pot tube, and the inlet water is directed to the descending pipe by the water inlet distribution pipe into the front and side lower joint box, and heated up through the inlet water wall pipe. The front and rear ends of the upper pot barrel are provided with a water trap at the boundary between the descending and rising water flow, and the water trap only separates the lower half of the cross section of the pot cylinder.

For forced circulation, the inlet water is connected to the front end of the lower box, from the front water wall pipe to the upper pot tube (at this time, the front water wall down pipe is canceled), and then transferred to the side water wall pipe down pipe to the side lower box, and then the side water wall pipe rises to the upper pot tube, and then descends from the front row of convection pipe bundles to the lower pot tube, and finally several processes are detoured between the upper and lower pot barrels to get water out from the rear end of the upper pot tube. Forced circulation boilers are not equipped with economizers.