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.
The tilting disc is much lighter and smaller than the disc in a swing check valve. Additionally, the center of gravity for the disc is very close to its pivot point. This means that the cracking pressure is much lower. The tilting disc check valve has much lower pressure drop at low flows than the swing check valve. However, at higher flow rates, the tilting disc has a higher pressure drop than the swing check valve.
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;
The tilting disc check valve should be installed either horizontally or vertically with the flow going up. If the flow direction is down, gravity will work on the disc and cause it to open when there is no flow. It is up to the constructor to ensure that the valve is installed with the right side facing up. Otherwise, the valve will not close when needed.
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.