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
In actual use, the apex of the valve stem is used as a mark, that is, the position where the valve is opened, as its fully open position. In order to consider the temperature change, there is a lock phenomenon, usually at the position of the opening to the apex, and then back to 1/2-1 circle as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the shutter, that is, the stroke. In some gate valves, the stem nut is arranged on the gate plate, and the rotation of the hand wheel drives the valve stem to rotate, and the gate is lifted. This valve is called a rotary rod gate valve, or a dark rod gate valve.
Longzhu always sticks to the principle"Credit first,quality first" and has been cooperating with HuaZhong Science and Technolology Material college to exploit capacity for new processes. Currently, we have improved greatly by introducing new techniques and equipments. Moreover, we have made some improvements in producing of safety valve, low-temperature valve, duplex steel valve specified for undersea oil well, and hydrogenation installation valve for oil-refining factories. Longzhu is noted for its strong technical power, advanced testing equipments, good record of delivery and steady quality of products. Longzhu got verified in the DIN EN ISO9001 for the quality system certification in 1999. In 2002，Longzhu got verified of the European Directive CE (PED) that based on the reliable quality, passed the TS certification in 2010. Longzhu consistently adhere to the policy of "treating people with sincerity, enhancing quality for prosperity" and regard "Final satisfaction of the customer" as its ultimate goal.
a. What are the customer's expectations of the performance of the material? – This is an important consideration often missed in the selection process. Particularly, what are the aesthetic requirements as compared to the structural requirements? Design life is sometimes specified but is very difficult to guarantee.
b. There may also be special requirements such as non-magnetic properties to take into account.
c. It must also be borne in mind that steel type alone is not the only factor in material selection. Surface finish is at least as important in many applications, particularly where there is a strong aesthetic component. Availability. There may be a perfectly correct technical choice of material which cannot be implemented because it is not available in the time required.