Model: D363H Series  |  Pressure: PN2.5 / PN4 / PN6 / PN10 / PN16 / PN25 / PN40  |  Connection: Butt-Weld  |  Medium: Steam, Oil, Gas, Water, Acid

Gaoshan Valve — D363H Bidirectional Triple Eccentric Hard-Seal Butterfly Valve (Butt-Weld)

Gaoshan D363H triple-offset hard-seal butterfly valve is the butt-weld version of the D43H series, designed for high-temperature and high-pressure service where soft-seat valves cannot perform. The triple-offset geometry ensures the disc lifts completely clear of the seat throughout the stroke, eliminating rubbing contact and reducing operating torque. The laminated metal disc seal withstands continuous service up to 425°C. Butt-weld end connections conform to GB/T 12221, with worm gear standard and pneumatic or electric actuator options.

Product Overview

Gaoshan D363H series triple-offset hard-seal butterfly valve is the butt-weld end connection version of the D43H family. It is engineered for high-temperature and high-pressure applications where elastomer-seated valves reach their limits and where welded piping is preferred. The triple-offset design ensures the disc surface lifts completely clear of the seat throughout the entire stroke, eliminating rubbing contact and reducing operating torque. The laminated stainless-steel and flexible graphite disc seal handles continuous service up to 425°C. Butt-weld ends are standard, with worm gear handwheel as standard and pneumatic or electric actuator options available.

Model Designation Guide

Triple Eccentric (Triple Offset) Principle

Gaoshan D363H uses three independent offsets to achieve zero-friction, pressure-assisted sealing across the full pressure range:

The result is simple: the disc never touches the seat during most of the stroke. Contact happens only in the final few degrees before full closure. This reduces operating torque and eliminates wear on the seat ring. The valve achieves bidirectional tight shut-off that meets Gaoshan’s zero-leakage standard throughout its service life.

Laminated Flexible Metal Seat Disc

The D363H disc sealing face uses a laminated metal construction developed by Gaoshan, which gives better high-temperature performance than solid metal or elastomer seats:

Materials of Construction

Applicable Media

Design & Inspection Standards

Connection Dimensions — D363H (Butt-Weld, DN80–DN1800)

Unit: mm  |  Dn=pipe bore, H0=face-to-face length, H=height, A=width, B=depth, G=gear handwheel diameter

1.6 MPa (PN10/16) — D363H-10C / 16C

4.0 MPa (PN25/40) — D363H-25C / 40C (DN80–DN1600)

Key Features & Advantages