Backflow Preventers

ZECO Valve Group is established in 1991, as an experienced china valve manufacturer. We have 5 factories in China, which are located in Shanghai, Yancheng and Wenzhou, which mainly manufacture pressure reducing valve, pressure relief valve, balancing valve, PICV, water valveand industrial valves.

Festures of Backflow Preventers

lThe double check valve is designed as a whole, with small structure；

lBody is streamlined with little resistance loss；

lCombination of a double check valve and safety drain valve can completely prevent backflow pollution under any working condition；

lAll moving parts are made of non-rust and wear-resistant materials with long service life.

As one of the backflow preventer suppliers, ZECOoffers many high quality produxts, such as 2.5 inch backflow preventer, 4 double check backflow preventer, 6 rpz backflow preventerand so on. Backflow preventers for two check valve series, when one of the seal damage, the other also ACTS as a seal to prevent backflow. However, when the sealing of two check valves is broken at the same time, the check function is lost. Backflow preventers on the common type of foundation in the middle of the drain, so even if two check valve sealing at the same time damage, it can also play a role in preventing backflow pollution.

This double backflow valvemust be installed horizontally, the environment of the installation site should be clean, there should be sufficient maintenance space, the main degree of safety drain or (air barrier) outlet is more than 300mm above the ground, and 3 inch backflow valveshould not be flooded by water or debris, and the installation area should be equipped with drainage facilities. If you don’t know where to buy backflow preventer, please consult ZECO Valve Group.

Backflow Preventers Material and Standard

Size Range: 2"~12"Pressure Rating: 10bar ~ 25barFace to Face Dimensions: AMSE B16.10, EN558-1Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2Coating: Fusion Bonded Epoxy CoatingInspection and Test: ISO 5208 / EN 12226-2

Part	Material	Standard
Body	Ductile Iron	EN 1563/DIN 1693
Bonnet	Ductile Iron	EN 1563/DIN 1693
Seat	CuZn39Pb1 / C37000	EN12167/ASTM B135
Stem	Stainless Steel 431	EN10088-1/ASTM A959
Spring	Stainless Steel 431	EN10088-1/ASTM A959
Seal	EPDM / NBR	ISO 4633
For the materials options not listed, consult factory. ZECO manufactures valves in more than 50 different alloys.

Other supplier products

	Metal Seated Butterfly Valve	As one of the china ball valve manufacturers, ZECO always adhere to exceed customer expectations,to provide customers with more international stand...
	Chemical	INDIA JSW DOLVI 1 Million Tons Coke Oven Project ZECO VALVE provided lug butterfly valves, cast steel gate valves and motorized ball chemical valve...
	Pressure Reducing Valve	It adjusts and controls the outlet pressure of the main valve to enable the outlet pressure of the main valve not vary with inlet pressure, enable ...
	Control Valve	ZhengFengbalanced trim control valves are widely used in water supply and drainage control systems in the global building market. As one of the ...
	Resilient Gate Valve for Underground 1025	Most of the 2.5 inch butterfly valveused in the walkway begin to be made of ductile cast iron, as copper or stainless steel becomes much more expen...

供应产品

Same products

	深圳专业生产德国假牙（义齿）厂家中国代理	卖方: 深圳义齿加工厂|义齿加工 深圳假牙加工|烤瓷牙|隐形全口义齿|种植牙齿	深圳MYY牙科技术有限公司成立于2000年，是中德合资企业，专业加工各类高品质义齿(假牙)，主要货件来自德国，公司实力雄厚，发展迅猛，已成为行业的后起之秀.在义齿行业。以德国技术、德国设备、为德...
	Perma PRO 250 106649 Lubricant Cartridge H1 SF10 Lubricant Cartridge	卖方: 广东聚广恒自动化设备有限公司
	蔓越橘提取物	卖方: 永州菁木生物科技有限公司	蔓越莓主要生长在北美，含有独特的原花青素，可以防止细菌（尤其是大肠杆菌）粘附在身体细胞上，从而降低感染风险。它们还可以改善动脉粥样硬化，增强心血管健康。蔓越莓富含维生素 C、铁、抗氧化剂和原花青...
	水飞蓟提取物	卖方: 永州菁木生物科技有限公司	奶蓟草，也称为水飞草或水飞蓟，是一种菊科植物，其药用历史已有 2000 多年。它的名字来源于其压碎的叶子的乳白色汁液。其提取物富含水飞蓟素、水飞蓟宾、黄酮类化合物和其他抗氧化剂，可对抗自由基、增...
	槐米提取物	卖方: 永州菁木生物科技有限公司	槐米提取物源自中国、日本、韩国和越南盛行的槐树花，富含芦丁和槲皮素等黄酮类化合物。这些黄酮类化合物具有有效的抗氧化、抗炎和血管保护特性。因此，该提取物广泛用于传统医学和保健品中，以增强心血管健康...