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.
Tilting disc check valves are installed in pumping applications to prevent backflow in the system. All interior parts are stainless steel or coated with drinking water approved epoxy. Measures are available to mitigate pressure surges like a lever and a weight fitted to the shaft end to help close the valve before the flow changes direction or a hydraulic damper that makes sure the disc does not slam into the seat and cause water hammer.
1 The sloping disc check valve can be closed quickly because the disc travel distance is very short, so it can quickly reach the valve seat position, thereby minimizing the impact.
2 The eccentric disc, when the valve is closed, gradually contact with the sealing surface, so as to achieve no impact and noiseless operation.
3 Micro-elastic metal valve seat with good sealing performance.
4 Butterfly valve disc design, fast, sensitive and long service life.
5 The inclined disc structure makes the fluid channel streamlined, with low flow resistance and energy saving effect. .
The seat sealing surface of the inclined disc check valve is a part of the oblique cone. The sealing line formed between the valve seat and the disc is an approximately elliptical curve, and the angle between the plane of the curve and the centerline of the valve flow channel is 60 degrees ; The long axis center of the approximate elliptical sealing line forms an angular eccentricity with the cone axis, that is, the second eccentric included angle between the axis of the cone where the valve seat sealing surface is located and the centerline of the valve body flow channel is 15 degrees to 20 degrees ；
The axis of the valve flap rotation shaft forms an eccentric amount relative to the axis of the cone, and is in an eccentric position relative to the plane where the sealing line is located;
When the pressure of the medium reaches its working pressure, the valve flap opens. When the pressure of the medium decreases, the butterfly swash plate valve flap automatically closes. Because the valve flap and the metal valve seat are eccentric, this structure makes the valve The flap is capable of pendulum movement. There will be no friction or sliding contact during the combination and separation of the disc beveled valve seat and the funnel-shaped valve disc;
When it is closed, it can quickly and without external force, and almost no impact or collision with the valve seat to achieve sealing. At the same time, it has the characteristics of large flow and small flow resistance;
Compared to the swing check valve where there is a bolted cap on top, the tilting disc check valve is difficult to do maintenance on. It typically will require removal of the entire valve from the process which is longer and more expensive than opening the top of the valve. This is because tilting disc valves usually have a split body. However, if there is a situation where there is tampering by the personnel operating the swing check valve, such as removing the disk because they don’t like it, a tilting disc might be a good solution
Tilting disk check valves can be installed in horizontal lines and vertical lines having upward flow. Some designs simply fit between two flange faces and provide a compact, lightweight installation, particularly in larger diameter valves. The disk lifts off of the seat to open the valve.