CNC machine tools ,large vertical lathes, drill press, milling lathe grinding machine , Welding machine , separate metal working workshops and many general machine tool etc.
Material analysis, PMI Material analysis. Chemical analysis. Low temperature test, Tensile Test ,Impact test, Hardness test. Wall thickness test, roughness test. Torque test. NDT Inspection (MT,PT,UT,RT). HIC test ,SSC test . Intercrystalline corrosion Test ,Uniform corrosion Test.
The company is the first one to pass ISO 9001(2008),ISO 14001 ,OHAS 18001 international quality system certificate, China pressure pipe safety registration certificate (AZ), European Union safety registration certificate (CE0036), and American Petroleum Institute Certificate (API 6D) and (API607) .
We are one of the member unit of China Valve Association as well as China Gas Association, member unit of first class supplying network of CNPC and member unit of fittings supplying network of State Power Corporation.
EDVC VALVE CO.,LTD.is a specialized in valve manufacturing enterprise with more than 15 years of history.We main produce Top Entry Ball Valve, Fully Welded Ball Valve, Arc Valve, Aluminum Bronze Valve, Automatic Recirculation Valve, Orbit Ball Valve, Safety Valve, Globe Valve, Tilting Disc Check Valve and Rising Stem Ball Valve etc.
The products have been exported to Austria, France, Germany, United Kingdom ,America, Middle East and Asia, Africa . areas and countries. Moreover, the products are widely used in the fields of oil & gas, Oil refinery, Petrochemical,power station ,Sewage treatment, pharmacy, Paper mills, pipeline industry , mining industry , chemical industry and environmental protection.
We are a professional manufacturer of valves in China, with the aim of "providing the first class products and services". On behalf of all of the members at EDVC Valve, we thank you for the opportunity to earn your business.
The expansion valve is an important part of the refrigeration system and is usually installed between the liquid storage tank and the evaporator. The expansion valve throttles the medium temperature and high pressure liquid refrigerant into low temperature and low pressure wet steam, and the refrigerant absorbs heat in the evaporator to achieve the cooling effect. The expansion valve controls the valve flow rate through the overheat change at the end of the evaporator to prevent underutilization of the evaporator area and cylinder knock.
The types of expansion gate valves can be divided into soft seal and metal hard seal parallel gate valves according to the sealing surface configuration, and can be further divided into: single cone expansion, double cone expansion gate type double gate valve. Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve. This type of valve should generally be installed horizontally in the pipeline.
Rotate the hand wheel, through the advance and retreat of the thread of the hand wheel and the valve stem, the valve plate connected with the valve stem can be raised or lowered to open and close. At the same time, due to the effect of the valve stem on the main gate, it It expands along the conical surface with the auxiliary gate to strengthen the close contact with the valve seat.
Expansion gate valves are used in wellhead devices and pipelines and can be adapted to a variety of media. Since they can self-compensate wear and force sealing, they are widely used.
Expanding gate seating functionality: ISV parallel expanding gate design achieves tight mechanical seal under variations in the line pressures by providing opposing gate forces to the upstream and downstream parallel seats at the end of the open and closed position.
Double expanding gate valves are made by two sliding pieces consisting of a gate and a second segment (male and female wedge segment). ... Sealing is achieved in both high and low pressure conditions by expanding the gate and the segment out towards the seats while the wedge is in a closed position.