With more than 30 years of casting history, Wenzhou Longzhu Industrial Co., Ltd. has a large number of experienced casting engineers and technicians. We can produce castings of various sizes, shapes and materials according to the drawings provided by customers, especially in the field of valve castings. Cooperate with Fortune 500 companies for many years.
GS-C251.0619,WCB.WCC,LCB,LCC,LC3,4C,4D,WC6,C5,C12, C12A,CA15，CF3,CF8(-196’C),CF3M,CF8M,CF8C,CD4MCu,CK3MC uN,ZG200-400,ZG230-450,ZG270-500,2G40Cr1,ZG20CrM0.2G15C r1Mo1V,ZG35Cr1MO.ZG16CrMOG(1Cr5Mo),ZG1Cr13,ZGOCr18Ni9 Ti.5A.KmTB Cr26.4A
Resin sand casting, etc.
Sales manager： Mrs.peng E-mail: email@example.com
Tel： 0086-0577-86621768 Fax： 0086-0577-86621935
Address ： No.19 Longyong Road.Xiongxin Village. Longwan,Wenzhou,Zhejiang,China
A check valve is a valve in which the opening and closing member is a circular valve flap and acts on its own weight and medium pressure to block the flow of the medium. It is an automatic valve, also known as a check valve, check valve, return valve or isolation valve. The flap motion mode is divided into lift type and swing type. The lift check valve is similar in construction to the shut-off valve and lacks only the valve stem that drives the flap. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side).
The selection criteria for the check valve are as follows:
1. The check valve should determine the corresponding size, the valve supplier must provide the data of the selected size, so that you can find the valve size when the valve is fully open at a given flow rate;
2. For high and medium pressure check valves below DN50mm, vertical lift check valves and straight lift check valves should be used;
3. For low-pressure check valves below DN50mm, butterfly check valves, vertical lift check valves and diaphragm check valves should be used;
4. For high and medium pressure check valves with DN greater than 50mm and less than 600mm, a swing check valve should be used;
5. For medium and low pressure check valves with DN greater than 200mm and less than 1200mm, wear-free ball check valves should be used.
Wenzhou Longzhu Industrial Co., Ltd. (Longzhu) is located in Wenzhou Xiongxin Industrial Zone, next to Yaoxi Scenic Zone in the south, 5km away from Wenzhou Airport, 12km away from Wenzhou Railway Station and 3km away from Wenzhou Longwan Wan-ton Wharf, enjoying beautiful sceneries and convenient transportation. Founded in 1986, Longzhu has gone through thirty years of winds and rains and developed into one of Wenzhou's largest professional casting enterprises integrating the R&D, casting, machining and marketing of valve castings and machine parts. Moreover, the company has been awarded "Model Integrity Enterprise", "Honest Private Business", "Zhejiang AAA-grade Credit Enterprise", and "Enterprise with Harmonious Labor Relation in Longwan District", Wenzhou Well-known Trademark and Zhejiang Well-known Trade Name. Moreover, the company was rated as National High-tech Enterprise in 2015.