High Performance Metal Seated Butterfly Valve , Triple Eccentric Butterfly Valve

Triple Offset Double Flanged Butterfly Valve Metal Seated Cast Steel Api609 BFV

Description

Butterfly valves’ operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve designs, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

Quick Details

1. Valve Type: Double Flanged Triple Offset Butterfly Valve Metal Seated

2. Standard: API609

3. Pressure rating: Class 150LB -300LB - 600LB

4. Size: 2” - 60"

5. Body materials: Cast Steel (carbon steel, stainless steel)

6. Disc: Carbon Steel, Stainless Steel

7. Stem material: Stainless Steel 13Cr, F304 / F316, 17 -4PH

8. Actuator: Lever, Worm gear, Pneumatic actuator etc

Features

1. The Seal Principle of Hard Seal Butterfly Valve Triple Offset

The Triple Offset Butterfly Valve provides a bi-directional bubble tight shut-off.This geometry ensures that the disc seal contacts the body seat only at the final shut-off position without rubbing or galling, providing a torque generated resilient seal with sufficient “wedging” to ensure auniform seal contact.

2. The Triple Offset Geometry
OFFSET 1 The shaft is offset behind the seat axis to allow complete sealing contact around the entire seat

OFFSET2 The shaft centerline is offset from the pipe and valve which provides interference free opening and closing of the valve

0FFSET3 The seat cone axis is offset from the shaft centerline to eliminate friction during closing and opening and to achieve uniform compressive sealing around the entire seat.

3. Friction Free Sealing for Long Cycle Life
(1) Seat is Cr13 Metal alloy or hardfaced with Stellite as standard.

(2) The gasket is spiral wound SS/Graphite for zero leakage.

(3) Seat ring forces are generated by the torque during closing uniformly around the entire circumference. The resilient seal fleses and energizes, assuming the shape of the seat. The compression forces equally distributed around the perimeter provide a tight bi-directional shut off.
The resiliency of the seal allows the valve body and disc to contract or expand, without the risk of jamming due to temperature fluctuations. It is self-adjusting.

Application

Hard Seal (Metal Seated)Butterfly Valve triple offset series are used in such fields as metallurgy, light industry, electric power, petrochemistry, coal gas channel etc.

Description

1. Standards

Design and Manufacture； API 609. MSS SP-67, MSS SP-68
Inspection and Test: API S98

End flange dimension: ASME B16 5 (NPS≤24). ASME B16 47 B series
BW end dimension: ASME B16.25

Face to face and end to end； API 609

Pressure-temperature ratings: ASMF B16.34

2. Materials List (Triple Offset Butterfly Valve)

3. Main Connection Dimensions