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 safety valve directly relies on the force generated by the medium pressure to overcome the mechanical load acting on the disc to open the safety valve. The mechanical load acting on the disc is mainly from the heavy hammer or spring, which is almost a fixed mechanical load. . To ensure the sealing performance of the safety valve, there must be strict requirements on the flatness and surface roughness of the valve seat sealing surface and the valve disc sealing surface.
According to the ratio of the maximum opening height of the safety valve disc to the valve seat diameter, it can be divided into:
⑴Slight opening type: The opening height of the valve flap is 1/20～1/10 of the valve seat diameter. Due to the small opening height, the structure and geometry of this valve are not as strict as the full-open type, and the design, manufacture, maintenance, and testing are relatively convenient, but the efficiency is low.
⑵Full-open type: the opening height of the valve disc is 1/4～1/3 of the valve seat diameter
The main parameter of the safety valve is the displacement. This displacement is determined by the diameter of the valve seat and the opening height of the valve clack. It is divided into two types: micro-opening and full-opening according to the opening height. Micro-opening means that the opening height of the valve flap is 1/40～l/20 of the throat diameter of the valve seat. Full-open type means that the opening height of the valve flap is 1/4 of the throat diameter of the valve seat.
There are two main categories: spring type and lever type. The spring type means that the seal between the valve clack and the valve seat relies on the force of the spring. The lever type relies on the force of the lever and the heavy hammer. With the need for large capacity, there is another impulse safety valve, also called a pilot safety valve, which consists of a main safety valve and an auxiliary valve. When the medium pressure in the pipeline exceeds the specified pressure value, the auxiliary valve opens first, the medium enters the main safety valve along the conduit, and the main safety valve is opened to reduce the increased medium pressure.
The safety/pressure relief valve is a standard diaphragm safety/pressure relief valve, which is mainly used in heating, air conditioning, thermal storage hot water systems, irrigation systems, control of cold and heat sources and system pressure. When the system pressure exceeds the set value of the safety valve, the safety valve automatically opens to release the system pressure to the atmosphere, and automatically closes when the pressure is lower than the safety value, so that the system with the safety valve can operate safely.
According to the structure of the safety valve can be divided into ⑴ Heavy hammer (lever) type safety valve, ⑵Spring type safety valve, ⑶ Pulse safety valve.
Breathing valve is often used on the top of the storage tank. It can be used to exhale or inhale from its name. It is generally composed of two valve chambers, one as the pressure side and the other as the vacuum side. When the pressure of the storage tank is too high, the valve on the pressure side will open, and the valve on the vacuum side will be closed at the same time, so that the gas in the storage tank is discharged; if the pressure of the storage tank is lower than the design pressure, the valve on the vacuum side of the breathing valve will open At the same time, the valve plate on the pressure side is closed and the atmosphere is sucked in. Its main function is to balance the pressure of the storage tank and avoid its collapse or expansion. Generally, a flame arrestor is also connected to the lower part of the breathing valve. The safety valve is often used at the end of the pipeline. Excessive pressure in the pipeline will release the pressure, and it is generally used in conjunction with rupture discs.