Categories of plug valves

1. According to structure, categories of plug valves can be classified into cylindrical plug valves and conic plug valves.
 
2. Materials of seal face
(1) Non metal sealed plug valves: Seal face of plug valves is made of PTFE, rubber, nylon, PPL, flexible graphite and other soft materials.
(2) Metal sealed plug valves: The material of seal face is metal.
(3) Oil Slick sealed plug valves: Utilize grease to seal.
 
3. Working pressure
(1) Vacuum plug valves: Working pressure is lower than standard atmospheric pressure.
(2) Low pressure plug valves: nominal pressure≤1.6MPa; Class 150LB
(3) Medium pressure plug valves: nominal pressure: 2.5~5.4MPa; Class 150-400LB
(4) High pressure plug valves: nominal pressure: 10.0~80.0MPa; Class 500-2500LB.
 
4. Working temperature 
(1) High temperature plug valves: temperature>450℃
(2) Mesotherm plug valves: temperature=120℃
(3) Normal temperature plug valves: temperature=-40℃
(4) Low temperature plug valves: temperature=-100℃
(5) Ultralow temperature plug valves: temperature≤-100℃
 
5. Face to face
(1) Flanged plug valves
(2) Internal thread plug valves
(3) External thread plug valves
(4) Welded plug valves
(5) Clip plug valves
(6) Cutting ferrule plug valves
 
Seal principle of plug valves
Based on the different structures and materials of seal face, plug valves adopt metal seal, grease seal and non metal seal. When using metal seal, beside low surface roughness and accurate geometric tolerance, high seal specific pressure is also needed to realize seal. When using grease seal and non metal seal, accurate shape is needed. For the requirements, sealing pair has various structures and seal principle is different.       
 
NO.2013 Valves catalog download
View and download valve product literature, sales brochures and more.
read more >>
News & Events
2017.07.19
2017 China (Zhengzhou) International Water Equipment and Technology Exposition
Event: 2017 China (Zhengzhou) International Water Equipment and Technology Exposition Venue: Central China International Expo Center (No.210, Zheng Bian Road, Zhengzhou City, Henan Province) Date: 201...
2017.07.10
Comparisons of Pneumatic Ball Valves and Electric Ball Valves
(1) Pneumatic ball valves The pneumatic ball valve consists of the ball valve and the pneumatic actuator. It generally needs to be used in conjunction with accessories including the magnetic valve, ai...
2016.08.16
Usage of Valve Standards in China
Valve products have been widely applied in petroleum, chemical engineering, nuclear power, metallurgy, electric power, hydraulic power, large coal chemical industry and other industries. Total quantit...
2016.08.04
Innovation, the Future Trend for Pneumatic Control Valve
Pneumatic control valve plays a vital role in automatic control system of modern factory. The competition is quite intense in pneumatic valve industry in China. The future development trend of pneumat...