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D43H Triple Eccentric Hard-Seal Butterfly Valve (Flanged)

D343H Triple Eccentric Hard-Seal Butterfly Valve (Flanged)

• Gaoshan D43H bidirectional triple eccentric hard-seal butterfly valve, PN2.5 to PN40, DN50–DN2000

• Laminated metal seat disc rated to 425°C; zero-friction open/close by triple-offset design

• Three eccentricities eliminate seat contact during stroke — extended service life in frequent cycling

• Flanged (D343H) end connections; body in cast steel or stainless steel

• Suitable for steam, high-temp oil, corrosive media, natural gas — bidirectional tight shut-off

Butterfly Valve Series

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产品详情

Model: D343H Series  |  Pressure: PN2.5 / PN4 / PN6 / PN10 / PN16 / PN25 / PN40  |  Connection: Flanged  |  Medium: Steam, Oil, Gas, Water, Acid

Gaoshan Valve — D343H Bidirectional Triple Eccentric Hard-Seal Butterfly Valve (Flanged)

Gaoshan D343H triple-offset hard-seal butterfly valve is 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. Flanged end connections conform to GB/T 9113, with worm gear standard and pneumatic or electric actuator options.

Nominal Pressure
PN2.5 – PN40
Size Range
DN50 – DN2000
Design Type
Triple Eccentric
Max Temperature
Up to 425 °C
End Connection
Flanged (GB/T 9113)
Operation
Worm Gear / Pneumatic / Electric

Product Overview

Gaoshan D343H series triple-offset hard-seal butterfly valve is engineered for high-temperature and high-pressure applications where elastomer-seated valves reach their limits. 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. Flanged end connections are standard, with worm gear handwheel as standard and pneumatic or electric actuator options available.

Model Designation Guide

Model Code Pressure Size Range End Connection Drive
D343H-10C / 16C PN10 / PN16 DN50 – DN2000 Flanged (GB/T 9113) Worm gear handwheel
D343H-25C / 40C PN25 / PN40 DN50 – DN1600 Flanged (GB/T 9113) Worm gear handwheel
D643H (Pneumatic) PN10 – PN40 DN50 – DN600 Flanged Pneumatic actuator
D943H (Electric) PN10 – PN40 DN50 – DN1600 Flanged Electric actuator 380V/220V

Triple Eccentric (Triple Offset) Principle

Gaoshan D343H uses three independent offsets to achieve zero-friction, pressure-assisted sealing across the full pressure range:

Triple Eccentric Principle Diagram

Offset 1 — Shaft Behind Disc Centreline
The valve stem is positioned behind the disc sealing face, so that when the disc closes it contacts the seat ring with uniform circumferential pressure. This geometry ensures tight shut-off around the full seat circumference.
Offset 2 — Shaft Off Pipeline Centreline
The stem centerline is offset from the pipeline centerline. This eliminates interference between the disc and body during opening, preventing the rubbing wear that conventional butterfly valves suffer in the 10°–80° open range.
Offset 3 — Conical Seat Axis
The seat cone axis is set at an angle to the pipeline centerline. This makes the disc sealing surface a true cone: as it rotates into the seat, contact pressure is applied evenly around the full circumference, avoiding localised stress and seat damage.

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.

Triple Eccentric Principle Diagram

Triple Eccentric Principle Diagram — replace YOUR-IMAGE-URL with actual image

Laminated Flexible Metal Seat Disc

The D343H disc sealing face uses a laminated metal construction developed by Gaoshan, which gives better high-temperature performance than solid metal or elastomer seats:

 

High-Temperature Capability — up to 538 °C
The laminated disc assembly is built with thin stainless steel rings separated by flexible graphite gaskets. Because the graphite is not adhesively bonded to the steel rings, the disc can handle much higher temperatures than any bonded rubber seat design.
Low Stem Seal Leakage — 10–20 ppm
Gaoshan D343H stem packing is finished to 8 RMS on the shaft and 32 RMS on the gland bore, achieving shaft-seal leakage of 10–20 ppm. The packing can be replaced on-site without removing the valve from the pipeline.
Anti-Blowout Shaft Protection
Gaoshan D343H is designed with dual anti-blowout protection.The bottom stem is retained by an internal collar; the top stem uses a shoulder that bears against the body bore. Both features prevent stem ejection if packing fails or pressure surges occur.

D343H Structural Diagram

D343H Structural Diagram — replace YOUR-IMAGE-URL with actual image

Materials of Construction

Component Standard Optional
Body (阀体) Cast Iron / Cast Steel (WCB) Stainless Steel (CF8, CF8M)
Disc (蝶板) Cast Steel Stainless Steel; Duplex SS
Shaft (阀杆) Cast Steel Stainless Steel (316)
Seat Ring (阀座) Carbon Steel Stainless Steel; PTFE-lined; Rubber-lined
Laminated Disc Seal Stainless steel + Flexible Graphite laminate All-SS laminate (high-temp); PTFE laminate (chemical)
Stem Packing Flexible Graphite PTFE; PTFE + Graphite composite

Applicable Media

Steam (High Pressure)
High-Temperature Oil
Water / Seawater
Natural Gas
Air / Compressed Air
Acid / Alkali Solutions
Salt / Brine Solutions
Pharmaceutical Process
Food & Beverage
Wastewater / Slurry
Weak Corrosive Media

Design & Inspection Standards

Design / Manufacturing Flange Connection Face-to-Face Length Pressure Test & Inspection
JB/T 8527 GB/T 9113 GB/T 12221 GB/T 13927

Connection Dimensions — D343H-10/16C (Flanged PN10/PN16, DN50–DN2000)

Unit: mm  |  D=flange OD, D1=bolt PCD, D2=bore, f=flange face width, b=flange thickness, Z-Φd=bolt quantity × diameter, H0=face-to-face, H=height, A=width, B=depth, G=gear handwheel diameter

1.0 MPa (PN10)

 

DN L D D1 D2 f b Z-Φd H0 H A B G
50 100 165 125 102 3 18 4-Φ18 82.5 195 50 144 180
65 112 185 145 122 3 18 4-Φ18 92.5 215 50 144 180
80 120 200 160 138 3 20 8-Φ18 125 240 62 200 300
100 127 220 180 158 3 20 8-Φ18 110 235 50 144 220
125 140 250 210 188 3 22 8-Φ18 125 290 60 200 300
150 140 285 240 212 3 22 8-Φ22 100 310 63 200 300
200 152 340 295 268 3 22 8-Φ22 202 360 63 200 300
250 165 395 350 320 3 26 12-Φ22 235 395 80 230 350
300 178 445 400 378 4 26 12-Φ22 265 425 80 230 350
350 190 505 460 438 4 26 16-Φ22 305 475 115 260 400
400 216 565 515 490 4 26 16-Φ26 305 475 115 260 400
450 222 615 565 532 4 28 20-Φ26 365 550 125 260 400
500 229 670 620 585 4 28 20-Φ26 365 550 125 260 400
600 267 780 725 685 5 30 20-Φ30 445 655 160 398 500
700 292 895 840 800 5 32 24-Φ30 495 710 200 418 600
800 318 1015 950 905 5 36 24-Φ33 655 885 200 418 600
1000 410 1160 1110 1005 5 38 28-Φ36 715 950 263 510 700
1200 470 1340 1280 1160 5 40 32-Φ39 840 1125 263 510 700
1400 530 1675 1535 1480 5 48 36-Φ42 980 1275 333 550 800
1600 600 1930 1685 1630 5 54 40-Φ48 1125 1470 374 590 900
1800 670 2115 2020 1960 5 56 44-Φ48 1240 1585 374 590 900
2000 760 2230 2170 2150 5 70 48-Φ48 1380 1720 453 635 1000

1.6 MPa (PN16)

DN L D D1 D2 f b Z-Φd H0 H A B G
50 100 165 125 102 3 18 4-Φ18 82.5 195 50 144 180
65 112 185 145 122 3 18 4-Φ18 92.5 215 50 144 180
80 120 200 160 138 3 20 8-Φ18 125 240 62 200 300
100 127 220 180 158 3 20 8-Φ18 110 235 50 144 220
125 140 250 210 188 3 22 8-Φ18 125 290 60 200 300
150 140 285 240 212 3 22 8-Φ22 100 310 63 200 300
200 152 340 295 268 3 22 8-Φ22 202 360 63 200 300
250 165 395 350 320 3 26 12-Φ26 202 360 80 230 350
300 178 445 400 378 4 26 12-Φ26 202 360 80 230 350
350 190 505 460 438 4 28 16-Φ26 305 475 115 260 400
400 216 565 515 490 4 28 16-Φ30 305 475 115 260 400
450 222 615 565 532 4 28 20-Φ30 365 550 125 260 400
500 229 670 620 585 4 30 20-Φ30 365 550 125 260 400
600 267 780 725 685 5 32 20-Φ33 445 655 160 398 500
700 292 895 840 800 5 34 24-Φ33 495 710 200 418 600
800 318 1015 950 905 5 38 24-Φ36 655 885 200 418 600
1000 410 1160 1110 1005 5 40 28-Φ39 715 950 263 510 700
1200 470 1340 1280 1160 5 44 32-Φ42 840 1125 263 510 700
1400 530 1675 1535 1480 5 48 36-Φ48 980 1275 333 550 800
1600 600 1930 1685 1630 5 56 40-Φ48 1125 1470 374 590 900
1800 670 2115 2020 1960 5 62 44-Φ56 1240 1585 374 590 900
2000 760 2345 2230 2150 5 70 48-Φ62 1380 1720 453 635 1000

Connection Dimensions — D343H-25/40C (Flanged PN25/PN40, DN50–DN1600)

Unit: mm  |  Z-W = bolt size designation (ASME-style for high-pressure flanges)

2.5 MPa (PN25)

DN L D D1 D2 f b Z-W H0 H A B G
50 108 165 125 102 3 20 4-Φ18 82.5 195 50 144 180
65 112 185 145 122 3 22 8-Φ18 92.5 215 50 144 180
80 120 200 160 138 3 24 8-Φ18 125 240 62 200 300
100 127 235 190 162 3 24 8-Φ22 110 235 50 144 220
125 140 270 220 188 3 26 8-Φ26 125 290 60 200 300
150 140 300 250 218 3 28 8-Φ26 100 310 63 200 300
200 152 360 310 278 3 30 12-Φ26 202 360 63 200 300
250 165 425 370 330 3 32 12-Φ30 235 395 80 230 350
300 178 485 430 395 4 34 12-Φ30 265 425 80 230 350
350 190 550 490 450 4 38 16-Φ33 305 475 115 260 400
400 216 620 560 505 4 40 12-Φ36 305 475 115 260 400
500 229 730 670 600 4 48 16-Φ36 365 550 125 260 400
600 267 845 770 685 5 57 16-Φ39 445 655 160 398 500
700 292 960 875 820 5 64 20-Φ42 495 710 200 418 600
800 318 1085 990 905 5 70 20-Φ48 655 885 200 418 600
900 368 1185 1090 1020 5 72 20-Φ48 715 950 263 510 700
1000 406 1320 1210 1140 5 76 24-Φ56 840 1125 263 510 700
1200 470 1530 1420 1355 5 84 32-Φ56 980 1275 333 550 800
1400 530 1755 1640 1565 5 93 36-Φ62 1125 1470 374 590 900
1600 600 1975 1795 1686 5 100 40-Φ62 1380 1720 453 635 1000

Key Features & Advantages

Zero-Friction Open / Close
The third eccentricity makes the disc lift completely clear of the seat during the whole stroke. No rubbing occurs at any opening angle, which greatly extends service life in frequent-cycle duty.
Pressure-Assisted Seal
Line pressure pushing on the disc cone increases seat contact force. The higher the pressure difference, the tighter the seal. Gaoshan D343H achieves zero-leakage performance in both flow directions.
High-Temperature Metal Seat
Gaoshan D343H uses a laminated stainless-steel and flexible graphite disc seal rated for continuous service up to 425°C, suitable for superheated steam and thermal oil applications.
Flanged End Connection
D343H uses flanged ends conforming to GB/T 9113. Flange drilling matches PN2.5 through PN40 bolt patterns. Companion flanges and fasteners are available as accessories.
Uniform Seat Compression
The inclined cone seat geometry applies even contact pressure around the full seat ring, avoiding localised stress that causes soft-seat valves to leak at the disc edges.
Wide Actuator Compatibility
Gaoshan D343H has an ISO 5211 top flange for direct mounting of worm gear, pneumatic, or electric actuators without extra brackets.

Request a Quote or Technical Consultation

Gaoshan D343H flanged triple eccentric hard-seal butterfly valve is available in PN2.5 to PN40, DN50 to DN2000. Custom body materials, seat options, and actuator configurations are available. Contact our engineering team for sizing, torque calculation, and certification support.

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