Views:0 Author:Site Editor Publish Time: 2021-09-30 Origin:Site
Fire extinguisher valves have butterfly valves, gate valves, check valves, pressure reducing valves, wet alarm valves, signal butterfly valves, automatic exhaust valves, explosion-proof valves, safety valves.
pressure reducing valve
wet alarm valve
signal butterfly valve
automatic exhaust valve
Also called flap valve, is a simple structure of the regulating valve, can be used for low pressure pipeline media switch control of the butterfly valve refers to the closing member (valve flap or butterfly plate) for the disc, rotating around the valve shaft to achieve the opening and closing of a valve, in the pipeline mainly play a cutting and throttling role. Butterfly valve closing member is a disc-shaped butterfly plate, rotating around its own axis in the valve body to achieve the purpose of opening and closing or regulating.
Rely on the medium itself flow and automatically open and close the valve flap, used to prevent the backflow of the medium valve, also known as a check valve, check valve, backflow valve, and back pressure valve. The check valve belongs to a kind of automatic valve, its main role is to prevent the backflow of the medium, to prevent the pump and drive motor reversal and the release of the container medium.
Through the adjustment of the inlet pressure to certain required outlet pressure and rely on the energy of the medium itself to make the outlet pressure automatically maintain a stable valve. Pressure reducing valve is a throttling element of local resistance that can be changed, that is, by changing the throttling area so that the flow rate and kinetic energy of the fluid change, resulting in different pressure loss, so as to achieve the purpose of pressure reduction. Then rely on the control and adjustment system adjustment to make the fluctuation of the pressure after the valve and the spring force balance, so that the pressure after the valve is kept constant within a certain error range.
A one-way valve that allows only one-way flow of water into the water spray system and alarm under the specified flow. The wet alarm valve normally equals water pressure before and after the valve flap (water through the guide tube in the water pressure balance hole, to keep the water pressure balance before and after the valve flap). Due to the self-weight of the valve flap and the total pressure of the water before and after the valve flap is different, the valve flap is closed (the total pressure above the valve flap is greater than the total pressure below the valve spool). In the event of a fire, the closed nozzle spraying water, due to the water pressure balance small hole to fill the water, the alarm valve above the water pressure drops, at this time the water pressure before the valve flap is greater than the water pressure after the valve flap, so the valve flap opens, the water supply to the standpipe and the pipe network, while the water along with the alarm valve annular groove into the delay, pressure switch and hydraulic alarms and other facilities, send a fire alarm signal and start the fire pump.
Where the use of gate valves, check valves, globe valves, plug valves, hose valves and diaphragm valves on the pipeline, especially in high-rise fire protection systems and the need to show the valve switch status on the pipeline system are available to replace the valve.
When the system is full of water, the gas in the water keeps escaping to the highest place because of temperature and pressure changes, when the gas pressure is greater than the system pressure, the float will fall and drive the valve stem to move downward, the valve opening, and the gas is continuously discharged. When the gas pressure is lower than the system pressure, the float will rise and drive the valve stem to move upward, and the valve port will be closed.
The opening and closing member is normally closed under the action of external forces, when the medium pressure in the equipment or pipeline rises above the specified value, the special valve to prevent the medium pressure in the pipeline or equipment exceeds the specified value by discharging the medium outside the system.