變頻恒壓供水設備通常被簡稱為變頻供水設備，它的基本屬性就是自動恒壓，泛指采用交流變頻器結合PID閉環控制技術來控制水泵機組以達到自動啟停和恒壓的供水系統的統稱。完整的變頻恒壓供水設備主要由增壓泵、管路閥門、穩壓罐和變頻水泵控制柜組成，只要具備這些結構或組成的恒壓供水系統不管是單臺泵還是多臺泵的系統都可以稱為變頻恒壓供水設備。具有全自動運行、自動調速、恒壓、壓力可調、節能環保、低噪音、清潔衛生、操作簡單等系列特點，廣泛用于各種建筑、工農業生產、水處理行業二次供水增壓。

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.

變頻恒壓供水設備分為直供水和間接供水兩種模式，直供水模式是指市政自來水直接通過增壓泵機組疊壓式二次增壓；間接供水模式是指將自來水存儲到水池水箱后再用增壓泵機組抽吸二次增壓，兩種供水模式各有優劣。

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.

變頻恒壓供水設備典型產品型號有：箱式變頻恒壓供水設備（間接供水）、無負壓供水設備（直供水）、和變頻水泵（直供水和間接供水皆可）三種

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)