压力开关是一个压力控制装置，当被测压力达到一定压力值时，压力开关能发出警报或控制信号。下面川消小编为您讲讲压力开关在电气消防中的具体应用。

The pressure switch is a pressure control device. When the measured pressure reaches a certain value, the pressure switch can send an alarm or control signal. Now let's talk about the specific application of pressure switch in electrical fire protection.

压力开关的分类：

Classification of pressure switches:

压力开关是一种简单的将系统的压力信号转换成电信号的压力控制装置，室内消火栓系统中压力开关的主要功能是将检测量与设定值相比较，在设定点输出开关信号，进行报警及联锁启动消防泵。

The pressure switch is a simple pressure control device that converts the pressure signal of the system into an electrical signal. The main function of the pressure switch in the indoor fire hydrant system is to compare the measured value with the set value, output the switch signal at the set point, alarm and interlock the fire pump.

压力开关主要有机械式和电子式两大类。

Pressure switches are mainly mechanical and electronic.

机械式压力开关采用纯机械形变导致开关元件动作。当压力增加时，传感压力元器件产生形变，通过栏杆、弹簧等机械结构，启动开关元件，使电信号输出。

The mechanical pressure switch uses pure mechanical deformation to cause the switching element to act. When the pressure increases, the sensing pressure components will deform. Through mechanical structures such as railings and springs, the switch components will be started to output electrical signals.

压力开关的接线：

Wiring of pressure switch:

工作方式：当压力上升到设定值上限时，蓝线和白线断开，当压力下降到预先设定的启泵压力值时，蓝线和白线之间导通。

Working mode: When the pressure rises to the upper limit of the set value, the blue line and the white line are disconnected. When the pressure drops to the preset starting pressure, the blue line and the white line are connected.

1、红、黑接报警主机的24V电源线，蓝、白线接消防控制柜。（蓝、白线导通输出一个无源触点）。

1. The red and black wires are connected to the 24V power line of the alarm host, and the blue and white wires are connected to the fire control cabinet. (The blue and white lines conduct and output a passive contact).

2、故低压压力开共4根线，没有接线端子可以接输入模块，低压力开关的动作信号无法反馈到主机。（低压力开关动作可以通过消防泵的启泵信号反馈给消防主机）。有人可能要问消防泵不能有自动停泵功能，低压压力开为什么有个上限值。水规要求零流量时压力不应大于设计工作压力的140%，所以只要把压力开关的上限值调到泵的扬程的1.4倍就可以了。

2. Therefore, there are 4 lines for the low pressure switch. There is no connection terminal to connect the input module. The action signal of the low pressure switch cannot be fed back to the host. (The action of the low pressure switch can be fed back to the fire engine through the pump start signal of the fire pump). Someone may ask why there is an upper limit value for the low pressure switch because the fire pump cannot have the automatic stop function. The water gauge requires that the pressure at zero flow should not be greater than 140% of the design working pressure, so it is only necessary to adjust the upper limit value of the pressure switch to 1.4 times of the pump head.

长期使用要定期检测它的性能是否完好，如失效或损坏时要由专员进行维修。更多相关事项的了解，就来我们网站http://www.cx-fire.com进行咨询了解吧！

If it is used for a long time, its performance should be checked regularly to see if it is in good condition. If it is invalid or damaged, the specialist should repair it. For more information on related matters, please come to our website http://www.cx-fire.com Consult and understand!