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 friction of the sealing surface of the globe valve is smaller than that of the gate valve, and it has the advantages of small opening height and suitable for high temperature media. The disadvantage is that the opening and closing torque is large, and it is not suitable for high temperature and high pressure media.
The structural type of the seal is a relatively unfamiliar classification method, but it is also an important classification method. Among them, the plane seal has no friction when in contact, and does not require high accuracy. The conical sealing type has the best sealing effect, but it is easily damaged. The thrust of the medium with the guided seal type is borne by the valve body, which further enhances the sealing performance. The spherical surface has the advantage of long life.
The stem of the globe valve generally moves up and down, and the hand wheel is fixed on the upper end of the stem. When the handwheel is turned clockwise, the valve stem drives the valve disc to move and close the valve.
According to the position of the trapezoidal thread of the valve stem, it can be divided into an upper threaded stem and a lower threaded stem. The trapezoidal thread of the upper threaded stem is located on the upper half of the stem; the trapezoidal thread of the lower threaded stem is located on the lower half of the stem. The upper threaded stem globe valve is convenient for maintenance and does not directly contact the medium. The total length of the lower thread globe valve is shorter, which can reduce the total height of the valve and facilitate installation.
Relying on the pressure of the valve stem, the sealing surface of the disc and the sealing surface of the valve seat are closely attached to prevent the medium from flowing. The shut-off valve only allows the medium to flow in one direction and is directional when installed. The structural length of the shut-off valve is longer than that of the gate valve, and the fluid resistance is large, and the sealing reliability is not strong during long-term operation.
Globe valves, so-called because of their outside shape, are widely used in plant piping. They are suitable for manual and automatic operation. Unlike the gate valve, globe valve can be used for regulating flow or pressures as well as complete shutoff of flow.
Gate valves are used for On-Off control while Globe valves are used for flow regulation. Gate valves offer little resistance to fluid flow in fully open position and also have small pressure drop across the valve. Is that correct? The globe valves are not.
The main difference between these two types is the way they close. A globe valve uses a plug (stem) that closes against the flow, and a ball valve has a gate (ball) that closes across the flow. Globe valves are good for regulating flow, whereas ball valves are better for on/off control without pressure drop.