Valve installation requirements power station valve structural advantages and technical specifications
Valve is in the fluid system, used to control the direction of the fluid, pressure, flow device, is to make pipe and equipment in the medium (liquid, gas, powder) flow or stop and can co ntrol the flow of the device. Valve is the control part of pipeline fluid conveying system, used to change the path section and medium flow direction, with diversion, cut-off, throttling, check, shunt or overflow pressure relief and other functions. Valves for fluid control range from simple globe valves to those used in extremely complex automatic control systems, with a wide variety of types and specifications, ranging in nominal sizes from extremely small instrument valves to industrial pipeline valves of up to 10m. Can be used to control the flow of water, steam, oil, gas, mud, all kinds of corrosive media, liquid metal and radioactive fluid and other types of fluid, valve working pressure can be from 0.0013mpa to 1000MPa high pressure, working temperature can c-270℃ to 1430℃ high temperature. Valve control can use a variety of transmission mode, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electric hydraulic, pneumatic, spur gear, bevel gear drive, etc.; In pressure, temperature or other form under the action of sensor signals, action, according to the requirement of the reservation or not depend on the sensor signals for simple open or shut down, rely on the drive or automatic mechanism makes opening and closing valve for lifting, sliding, place or rotary movement, so as to change the size of the port in order to realize the control function. Installation requirements 1, before the valve installation, should carefully check the valve model, specification and design; 2, according to the valve model and factory instructions to check whether the valve can be used in the required conditions; 3. When lifting the valve, the rope should be tied to the flange connection of the valve body and the valve cover, and not tied to the handwheel or stem, so as not to damage the stem and handwheel; 4. When the valve is installed on the horizontal pipeline, the valve stem should be vertically upward, and it is not allowed to be installed downward; 5, when installing the valve, shall not use the forcible pair connection mode, so as not to cause damage due to uneven force; 6, the stem gate valve should not be installed in the underground damp place, so as not to stem rust. Assembly requirements clean parts must be sealed for installation. The installation process requirements are as follows: 1. The installation workshop must be clean, or set up temporary clean areas, such as newly purchased colored strip cloth or plastic film, to prevent dust from entering during the installation process. 2, assembly workers must wear clean cotton work clothes, wear a pure cotton cap, hair can not leak, feet wear clean shoes, hands wear plastic gloves, degreasing. 3, assembly tools must be degreased before assembly, to ensure clean. Acceptance Requirements The acceptance is in accordance with HG 20202-2000 Code for Construction and Acceptance of Degreasing Engineering. Before assembly, wipe each part with clean precision filter paper, select dead corners of parts, and the filter paper with unchanged color is qualified. 1, the valve model should be indicated according to the NATIONAL standard number requirements. If the enterprise standard, should indicate the relevant description of the model. 2, the valve working pressure, requirements ≥ pipeline working pressure, without affecting the price of the premise, the valve can bear the pressure should be greater than the actual pipeline pressure. 3, valve manufacturing standards, should explain the basis of the NATIONAL standard number, if the enterprise standard, the procurement contract should be attached to the enterprise document. For more details, please refer to: Installation requirements of valve Structure Advantages and technical specifications of power station valve “Power station valve”, also known as power station valve, is mainly applicable to the pipeline of various systems of thermal power stations, cutting off or connecting pipeline media. Applicable medium: water, steam and other non-corrosive medium. Compared with other valve products, power station valve is characterized by high temperature and high pressure, unique self-sealing design, the higher the pressure, the more reliable the sealing. Due to the special performance, technical characteristics and working conditions, the product has formed the characteristics that other products can not be replaced. The valve seat and disc sealing surface are made of cobalt-based carbide plasma spray welding, with good abrasion resistance and abrasion resistance.
I. Brief introduction of power station valve
“Power station valve” is also known as the power station valve, mainly suitable for thermal power stations in various systems of the pipeline, cut off or put through the pipeline medium. Applicable medium: water, steam and other non-corrosive medium. Compared with other valve products, power station valve is characterized by high temperature and high pressure, unique self-sealing design, the higher the pressure, the more reliable the sealing. Due to the special performance, technical characteristics and working conditions, the product has formed the characteristics that other products can not be replaced.
Main design specifications for power station valves
Design and manufacture GB/T12234 ASMEB16.34
Structure length JB/T3595
Connector size JB/T3595 GB/T12224
Inspection and testing JB/T3595 MSS SP61
Pressure and temperature reference JB/T3595 ANSI B16.34
Main pressure grades of power station valves
Nominal pressure 200, 250, 320
Working pressure P 55 100V, P 55 140V, P 55 170V
Four, power station valve structure advantages
1. The pressure self-tightening seal is adopted, and both ends of the valve body branch pipe are welded.
2. The valve seat and valve disc sealing surface are made of cobalt-based hard alloy plasma spray welding, with good abrasion resistance and abrasion resistance.
3. The valve stem has good corrosion resistance and abrasion resistance after anti-corrosive nitriding treatment.
V. Relevant standards for power station valves
JBT 3955-2002 Power station valves general requirements
JB/T 5263-2005 Technical specifications for steel castings for power station valves
JB/T 4018 power station valve model formulation method
DL 959-2005 Guide for application of safety valve in power plant boiler
DLT 531-1994 Technical specification for high temperature and high pressure globe valves for power stations
DLT 641-2005 Power station valve electric actuator
DLT 850-2004 power station piping
GB 10869 Specification of power station regulating valve
GBT 10868-2005 temperature and pressure reducing valve for power station
Post time: Jul-26-2022
