| No. |
name |
structural features |
applicable design standard |
| 1 |
weir type diaphragm valve |
Travel is short, a larger flow resistance (relative to straight-through), the requirement diaphragm flexibility is lower. Weir type diaphragm valves have plastic lined, rubber lined, lining enamel and non-lining structure, is the most widely used type of diaphragm valves, with a certain degree of throttling characteristics, can be used for the vacuum. Corrosion resistance and anti-particle media is good. Sealing is reliable, low cost. body has an overall structure of casting and forging welding, forge welding structural body material density is higher, can be used for high vacuum mining
connecting ends forms: flange, thread, butt welding and socket welding, etc.
Drive mode: manual, electric, pneumatic, etc.
nominal diameter scope：DN15～400mm |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
| 2 |
through way diaphragm valve |
Flow resistance is small, a longer stroke (relative to the weir-type), the flexible diaphragm require higher, cut off performance and flow capacity are good and can be used for high vacuum. Corrosion-resistant, can be used in granular media, cavity can be lined with plastic, rubber or enamel
connecting ends forms: flange, thread, butt welding and socket welding, etc.
Drive mode: manual, electric, pneumatic, etc.
nominal diameter scope：DN15～300mm |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
| 3 |
oblique diaphragm valve |
With characteristics of globe valves and diaphragm valves, seat sealing uses coated non-metallic materials metal disc, has a high carrying capacity and tightness. Diaphragm as the middle flange sealing and stem packing sealing, also as barrier of isolating body and bonnet, sealing is reliable. body flow was streamlined, circulation is good, flow resistance is small, non-deposition medium dead. body cavity may be lined with plastic or rubber. Usually is flange or welded connections
nominal diameter scope：DN100～400mm |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
| 4 |
needle diaphragm valve |
With the characteristics of needle globe valves and diaphragm valves, trip is less diaphragm flexibility demand is low, body cavity may be lined with plastic or rubber, usually is thread connections
nominal diameter scope：DN15～80mm |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
| 5 |
weir ceramics diaphragm valve |
The body uses ceramic whole forming or metal body ceramic-lined structure. diaphragm adopts flexible thin-film PTFE materials to improve anti-wear and corrosion resistance. the back of diaphragm lined thick rubber to enhance its carrying capacity
Ceramic forming parts must be resistant to 80 ℃ temperature changes and would not damage
Connection Type: mainly wafer type and flange type
nominal diameter scope：DN15～200mm |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
| 6 |
weir plastic diaphragm valve |
General structure in addition to stem and fasteners, other parts are plastic or rubber material. It can be used in strong corrosive media
connecting type: generally is flange and thread connection
nominal diameter scope：DN15～250mm |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
| 7 |
oblique and right-angle glass diaphragm valve |
the main material is glass. Structures usually have two kinds: straight-through and right-angle forms, body is transparent, and can observe movement and reaction and other situations of media material in the valve. Connecting type usually is piston flange
nominal diameter scope：DN15～200mm |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
| 8 |
sleeve-shaped diaphragm valve |
Compact structure, open and close quickly, can play a certain throttling and reduction of media pressure fluctuation and so on. Connecting type is usually thread connection. |
GB/T 12239-1989
MSS-SP-88-1988
ISO 5752-1988
BS 5156-1985 |
