Product Model: D343H/D373H

Nominal Diameter: DN40–2000 mm

Nominal Pressure: PN1.6~4.0MPa 

Applicable Temperature: ≤425°C 

Main Material: Cast iron, Cast steel, Stainless steel, etc. 

Applicable Media: Air, water, sewage, steam, coal gas, oil products, etc.

Product Overview
The D343H series extended stem butterfly valve is mainly composed of a valve body, valve shaft, disc, seat, extended stem, and a driving mechanism (lever, worm gear, pneumatic device, or electric device). The driving mechanism drives the rotating shaft and disc to rotate, thereby achieving opening/closing and flow control. It is suitable for flow regulation and media shut-off in water supply, drainage, and gas pipelines with a medium temperature ≤425°C in industries such as metallurgy, food, pharmaceuticals, chemicals, petroleum, power, light textile, and papermaking.

Structural Features

1. Novel and reasonable design, unique structure, light weight, and fast opening/closing.

2. Low operating torque, convenient operation, labor-saving and nimble.

3. Can be installed in any position, convenient for maintenance.

4. The sealing parts are replaceable, and the sealing performance is reliable, achieving bidirectional zero leakage.

5. The sealing materials are aging-resistant, weak corrosion-resistant, and have a long service life.

Manufacturing Standards

• Design Standard: GB/T 12238-1989 (Note: Original text says GB/T2238)

• Flange Connection Dimensions: GB/T 9113.1-2000; GB/T 9115.1-2000; JB 78

• Face-to-Face Dimensions: GB/T 12221-1989

• Pressure Test: GB/T 13927-1992; JB/T 9092-1999

• Connection Type: Flanged, Wafer

• Operation: Worm gear drive, Electric, Pneumatic, Hydraulic