变频恒压供水设备通常被简称为变频供水设备，它的基本属性就是自动恒压，泛指采用交流变频器结合PID闭环控制技术来控制水泵机组以达到自动启停和恒压的供水系统的统称。完整的变频恒压供水设备主要由增压泵、管路阀门、稳压罐和变频水泵控制柜组成，只要具备这些结构或组成的恒压供水系统不管是单台泵还是多台泵的系统都可以称为变频恒压供水设备。具有全自动运行、自动调速、恒压、压力可调、节能环保、低噪音、清洁卫生、操作简单等系列特点，广泛用于各种建筑、工农业生产、水处理行业二次供水增压。

Frequency conversion constant pressure water supply equipment is usually referred to as frequency conversion water supply equipment, its basic attribute is automatic constant pressure, generally refers to the use of AC frequency converter combined with PID closed-loop control technology to control the pump unit to achieve automatic start-up and stop and constant pressure water supply system collectively. The complete variable frequency constant pressure water supply equipment is mainly composed of booster pump, pipeline valve, pressure stabilizing tank and variable frequency water pump control cabinet. As long as the constant pressure water supply system with these structures or components, whether it is a single pump or a multi pump system, it can be called variable frequency constant pressure water supply equipment. It has the characteristics of full-automatic operation, automatic speed regulation, constant pressure, adjustable pressure, energy saving and environmental protection, low noise, clean and sanitary, simple operation and so on. It is widely used in various construction, industrial and agricultural production, water treatment industry secondary water supply pressurization.

变频恒压供水设备分为直供水和间接供水两种模式，直供水模式是指市政自来水直接通过增压泵机组叠压式二次增压；间接供水模式是指将自来水存储到水池水箱后再用增压泵机组抽吸二次增压，两种供水模式各有优劣。

Frequency conversion constant pressure water supply equipment can be divided into direct water supply mode and indirect water supply mode; Indirect water supply mode refers to the storage of tap water in the pool water tank and then pumping by booster pump unit for secondary pressurization.

变频恒压供水设备典型产品型号有：箱式变频恒压供水设备（间接供水）、无负压供水设备（直供水）、和变频水泵（直供水和间接供水皆可）三种

The typical product models of variable frequency constant pressure water supply equipment are: box type variable frequency constant pressure water supply equipment (indirect water supply), non negative pressure water supply equipment (direct water supply), and variable frequency water pump (both direct and indirect water supply)