双法兰蝶阀

Concentric double flange
Comply with BS EN593 / BS 5155 (Double flange short body) / ISO
5752 / EN 558-1 Basic Series 13 (Double flange short body) / MSS
SP-67
Flange drilled to BS 4504 PN16 / EN1092-2 PN16 / ANSI CLASS 150
/ JIS10K / AS 2129 TABLE E (Specify on order)

Body	Ductile Iron
Disc	Ductile Iron Aluminium Bronze Stainless Steel 304 Stainless Steel 316
Shaft	Stainless Steel 410 Stainless Steel 431
Seat Ring	EPDM/NBR
O-Ring	EPDM/NBR
Bushing	Bronze

Cast Iron 1-Stage Worm Gear and Hand Wheel
Carbon Steel Gear Box Shaft

Cast Iron 2-Stage Worm Gear and Hand Wheel
Carbon Steel Gear Box Shaft

Ensure sufficient space for valves for easy installation, operation, maintenance and replacement.
Verify the valves are suitable for the operating condition such as medium, operating pressure / temperature, etc.
Check the I.D. of the flange and pipe to ensure free disc movement.
Valves shall be mounted on flanges only after the counter flanges have been welded to pipe and cooled down to the atmospheric
temperature. Welding heat may damage the rubber seat of the valves. Never weld the flanges with valves installed. No gasket is
required for installation of rubber seated butterfly valves.
Position the valves carefully between flanges. Accurate centering between flanges is essential to prevent any damages and
problems during operation.
Valves should be installed by placing bolts through the hole and tightening carefully, ensuring even contact between the flange
and seat. Too tight of space may cause damages to the seat and should be avoided.
Cross tighten all the bolts diagonally to distribute the loads evenly over the valves.
Turning the valves to ensure sufficient disc clearance.
Valves equipped with manual operators must be operated manually. Excessive external force on the operation of valve may
damage the valve and / or operator.