Breather Valves, also known as direct acting Pressure/Vacuum Relief Valves, are special types of Relief Valves which are specifically designed for tank protection. The range includes pressure only, vacuum only and combined Pressure/Vacuum Valves, all available with flanged outlets or vented to atmosphere. Pressure/Vacuum Relief Valves are used extensively on bulk storage tanks, including fixed roof tanks with floating covers, to minimize evaporation loss. The Valves prevent the build-up of excessive pressure or vacuum which can unbalance the system or damage the storage vessel. Pressure and vacuum protection levels are controlled with weighted pallets or springs and can be combined to provide the required Pressure/Vacuum settings. It is common to combine pallet and spring systems in one unit i.e. pressure settings require a spring section, whilst the vacuum settings use the pallet method.

Hangzhou Hitech Petrochemical Equipment Co., Ltd. founded in 2001, is a high-tech production enterprise specializing in design, development and manufacturing of all kinds of tower internals, packings, and tower plates, Oil pipeline, seals, valve etc.We have passed ISO9001 quality management system certification, with the right to import and export. In addition, we have cooperated with the colleges and universities, and innovated scientific research units at home and abroad since the 1900s, successively innovated several series of products, and won over 30 national patents, and been awarded as a county-level patent demonstration enterprise. At present, we mainly serve some major engineering companies at home and abroad, and possess manufacturer qualification designated by the engineering companies in Japan and other countries.

Production equipment: full-automatic production line and degrease equipment exist in the structured packing and random packing, the manufacturing workshop in the tower internals owns first-class equipment and manufacturing level in China, and we mainly serve and support the large foreign engineering companies.

The best quality, reasonable price, and perfect service are our forces in fierce market competition. 

Our products sell well in the fields such as fertilizer, chemical industry, oil, sulfuric acid, environmentally-friendly power,coking and pharmaceuticals. and our products are exported to the United States, Japan, Germany and other countries.  We have won praises and trusts from new and old customers.