The tied diaphragm valve, D688, is a high-pressure inline valve designed for ultra-high-purity gas distribution systems. Equipped with a pneumatic actuator, it ensures exceptional tightness, guaranteeing optimal performance and safety.
Key features
Combined soft and metal seat design with low permeation rate.
Welded diaphragms provide a high leak tightness integrity
Tied diaphragm design which minimizes gas wetted volume to allow easy purging.
No moving components in the gas wetted area to not generate particles.
Secondary sealing to prevent the gas coming in contact with actuator in the case of diaphragm failure.
Threaded weep hole for leak test and pipe away connection (M4 thread), allows the connection to a leak detector.
π0029 (according to TPED), 3 stars, valve number, manufacturing date, Nominal pressure and flow direction
Leak rate
1.10 -8 m bar L/s
Connections
According (inter-)national standards, customer’s specifications
Body materials
Stainless steel 1.4435 (AISI 316L)
Working pressure
200 bar
Nominal flow rate
CV = 0.25
Seat orifice size
4 Mm
Temperature range
-40 to +65°C
Product information and images are compiled from the manufacturer's own publications; they do not depict a Sedan Mühendislik installation. Technical data is confirmed before ordering.
Tell us the protected volume and we will size the system together
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