ACOL (Shanghai) Online Controls Co., Ltd. ,we're a professional manufacturer in HVAC area for many years . Specializing in producing various Flow Switch, Differential Pressure Switch, Auto Filling Valve, Safety Valve, Automatic Air Vent Valve, Expansion Tank, Differential Pressure Transmitter, Temperature and Humidity Transmitter, etc. We combine the design\produce\and sales for integration and have got many patents for our special design. Also we are a professional supplier in the refrigeration field for some very famous companies, our customers including Trane ,York, Climaveneta, Dunham-bush and some other famous brand.

Our products are excellent quality, safety, and flawless function and a very competitive price. Our creation and fashionable designs satisfy the requirements of a broad range of customers. We own very good and professional after-sale service .