Hard Seal Butterfly Valves

Model NO.: D343 Connection Form: Lug Support Seal Form: Auto Sealed Work Pressure: Low Pressure (Pn<1.6mpa) Material of Seal Surface: Metal Hard Sealed Application: Industrial Usage, Water Industrial Usage, Household Usage Transport Package: Polywood Driving Mode: Manual Structure: Three-Eccentric Sealing Valve Stem: Normal Working Temperature: Medium Temperature (120°C<T<450°C) Valve Body: Casting Material: Wcb 216, 304. 316 HS Code: 84134090


The Solid Quarter Turn Valve is a ZERO LEAKAGE Metal Seated Valve that features a triple eccentric, non-rubbing conical metal seat which offers tight shut off for many thousands of cycles. The seating of the valve is actually enhanced by continued operation. These unique design features combine to give the Solid valve the following attributes: Bidirectional tight shut off on services ranging from cryogenic to 600 degree centigrade, limitations being governed by the selection of body, disc and seal materials. The Solid is inherently fire safe which means the valve can offer ZERO LEAKAGE before, during and after the fire as there are no soft components in the valve seating areas. Simple  direct mounted on ISO standard mounting flanges. The Solid has good control characteristics through most of its travel, and with the addition of a positioned will give control suitable for many applications. The standard valve is wafer pattern conforming to API 609 dimensions and has enormous space and mass savings when compared with other types of valves. Solid valves are also available in full lug and flanged patterns with dimensions in accordance with ISO 5752 or API 600, making them interchangeable with gate, ball and plug valves. As can be seen from the illustration, this design utilizes a wedging action to put the laminated seal ring in compression when in contact with the body seat. Further, as the seal ring has clearance between disc and the inside of the lamellar it is able to self align and also flex to absorb stresses that might be induced by temperature fluctuations or pipeline movement.

CarbonSteel/ENC
The material selection will determine the suitability of the valve for the service media and the expected temperature range. The responsibility for final material selection rests with the customer. We can, however, suggest suitable combinations based on our experience. The following table shows the current material selection that is available, but special materials can be substituted to suit particular applications
Body and disc	Seat	Spindle and keys	Laminated seal ring	Bearing	Packing and Gaskets
CarbonSteel/ENC	Stainless steel	AISI 431	AISI 304	Stainless chrome or nickle plated	Graphite/gaphoil
Stainless steel	Stellite 21 or Colmonoy wearresistant facings	17-4ph AISI 630	AISI 316	Stellite shell	Graphoil
Acid resistant alloy steels	Special alloys		FAL 223	Hardened stainless	Graphite with Bearing prot graphoil
Steels for high and cryogenic temperatures				Sintered PTFE and bronze