Introduction to high temperature and high pressure valves for thermal power generation
2020-07-17
Thermal power generation refers to the way in which fuel combustion is required to generate electricity, specifically to power plants that use coal and natural gas as fuel to generate electricity.Its energy conversion is fuel combustion chemical energy → steam thermal energy → mechanical energy → electrical energy. The production process uses the heat emitted by fuel combustion to heat the water, so that the water becomes steam and superheated steam after being heated. Steam drives the steam turbine, the steam turbine drives the generator, and the generator emits electrical energy.The power generation process flow is shown in Figure 1, which mainly includes three parts: the soda water system, the combustion system, and the wind and smoke system.
28
2020-05
Selection of fasteners for valve pressure bearing parts and calculation of preload torque
1. The structure of commonly used fasteners for valves (1) The pitch of threaded fasteners for pressure-bearing parts Metric ordinary threads are the most used mechanical fastening threads for valves. Generally, each metric ordinary thread of nominal diameter has multiple pitch, divided into coarse teeth, fine teeth, and ultra-fine teeth. In HG/T 20613 "Fasteners for Steel Pipe Flanges PN Series", HG/T 20634 "Fasteners for Steel Pipe Flanges CLASS Series", DL-439 "Technical Guidelines for High Temperature Fasteners for Thermal Power Plants", GB/T 12234 "Steel Gate Valves with Studs Connecting Valve Caps for the Petroleum and Natural Gas Industry" In the valve design standards and fastener technical guidelines, the fastener pitch is specified.After analyzing these standards, it is concluded that fasteners with a nominal diameter ≤M27 generally use a coarse thread pitch, and fasteners with a nominal diameter >M27 use a fine thread pitch with a pitch of 3. From this, it can be concluded that when the nominal diameter of the thread is large, a smaller pitch (fine thread) is generally used. This is because fine thread threads have the characteristics of small thread lift angle, strong self-locking ability, small torsional stress when tightening, and large rotation angle when tightening the nut. Easy to control, but the pitch is not as small as possible, and the pitch of ultra-fine teeth is generally more expensive. , Commonly used in precision fit.
19
2019-02
Design standards and scope of application of globe valves
Category Standard code Standard name Scope of application Nominal diameter/mm Nominal pressure or pressure level application Forged steel JB/T7746-1995 Reduced diameter forged steel valve 10～502.5～25MPa General cast steel JPI-7S-46-1999CL150, 300 flange type cast steel valve 32～350Cl150, CL300 Petroleum and Petrochemical JISB2071-1999 flange connection forged steel globe valve 40～ 20010K, 20K universal JISB2072-19991.0MPa flange connection cast steel angle valve 40～20010KJISB20
19
2019-02
Design standards for steam traps
Standard code Standard Name Standard code Standard name JB/T9093-1999 Steam trap technical conditions BS6023-1981 Steam trap term GB/T12248-1989 Steam trap term BS6024-1981 Steam trap mark GB/T12249-1989 Steam trap mark BS6025-1982 Steam trap factory inspection and working characteristic test GB/T12250-1989 Steam trap structure length BS6026-1981 flange connection steam trap structure length GB/T12251-
19
2019-02
Introduction to the classification of gate valves and analysis of their advantages
The gate valve uses the gate plate as the opening and closing member. The valve stem is raised and lowered to drive the gate plate up and down to achieve the opening and closing of the valve. The direction of movement of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed, not adjusted and throttled.It can be applied to water, steam, oil, nitric acid, acetic acid, oxidizing media, urea and other media respectively.
19
2019-02
Material selection of chemical valves
Corrosion has always been one of the most common hazards of chemical equipment. If you are careless, the equipment will be damaged lightly, and the heavy will cause accidents and even disasters.According to relevant statistics, about 60% of the damage to chemical equipment is caused by corrosion. Therefore, when selecting chemical valves, we must first pay attention to the scientific nature of the material selection.There is usually a misunderstanding that stainless steel is a “universal material”, no matter what medium and environmental conditions can produce stainless steel valves, which is very dangerous.
Contact Us
WeChat Official Account：
Beijing Valve General Factory Co., Ltd.
Switchboard：
Fax：
Sales hotline：
Email：
Address：
No. 3, Lvhai Road, Pangezhuang Town, Daxing District, Beijing
Learn More
