How to choose fire pump low pressure switch

How to choose fire pump low pressure switch

First: know the requirements of low-pressure switch used on fire pump .

Generally speaking, the low-pressure switch is located in the fire pump water outlet pipe .There are two usage scenariosneed to considered when setting up:

(1) When high level fire water tank placed high enough and do not need the Pressure stabilizing pump, the setting value of pressure switch should be static pressure value gived by the fire tank low alarm water level .

(2)If the high-level fire water tank is not placed too high, and need to have a pressure-stabilizing pump,At this time the pressure switch start up fire pumps directly, so the setted value should be ensured that the pump will start quickly. At this point start up value should be greater than the static pressure value of pressure switch produced by the high-level fire water tank .

This ideal also could prevent The pressure switch from affecting the pump start-up due to the slow drop of the liquid level in the high water tank.This is a very important point, understanding this, we can further on the specific selection of low-pressure switch .

Second: after understanding the pressure switch settings, we also need toconsult with professional sales about pressure switch model and pressure switch specific use .

The problem of how to select a pressure switch has been very easy for the engineers who often use and install pressure switches.But because the pressure setting values of fire hydrant pressure switch and fire pump pressure switch are not uniform, the starting pump pressure is 0.07 ~ 0.1 MPA lower than that of quasi-working state.In general, low pressure switch is not adjustable, but there are some special for fire pressure switch, in the specific purchase also please consult the manufacturers carefully.

The function of the fire pump low pressure switch is when the pressure in the fire spray pipe is less than the pressure in the water supply end, the pressure switch will act automatically and feed back the action signal to the main engine of the fire automatic alarm system.The control engine receives the signal and start the fire fighting spray pump to pressurize.Do not think that your task is completed after selecting the right low-pressure switch, the post-maintenance is also very important.