1. Description

The air pressure maintaining device and the pre-action alarm valve group, the control panel, the air supply device, and the piping accessories form a pre-action device.

The air pressure maintaining device is composed of an electric contact pressure gauge, a check valve, a pressure reducing valve, a control valve, a pressure reducing orifice plate and a filter.

The control panel, the air pressure maintaining device and the air supply device are used together, and the air pressure in the system side pipe network is normally maintained between 0.03 MPa and 0.05 MPa to detect the tightness of the system side pipe network, and the live working conditions of the live parts are monitored in real time. And feedback signals to the fire control center.

Product standard: GB5135.14 "Automatic sprinkler system Part 14: Preaction device"

Design Specification: GB50084 "Design Specification for Automatic Sprinkler System"

Acceptance specification: GB50261 "Code for construction and acceptance of automatic sprinkler system"

2. function

1) When the system is established, the pre-action system pipe network is pressurized to 0.05MPa by the quick air supply valve;

2) After the system is established, close the quick air supply valve and control the start and stop of the air compressor by using the upper and lower limits of the electric contact pressure gauge (0.03-0.05 MPa);

3) When the nozzle or pipe in the spray pipe network leaks, the pressure of the pipe network is rapidly reduced due to the action of the pressure reducing valve, so that the pressure controller operates to send a low-voltage fault alarm signal below 0.02 MPa;

4) Due to the function of the check valve, the leakage of a set of spray pipe network will not cause the low pressure pressure controller of other spray pipe networks to operate. The alarm indication of the leak alarm indication area is clear. When the system pipe network is linked to water, avoid water. The accident of pouring into the air compressor.

3、Technical Parameters

4、Structure diagram