Electric Butterfly Valves

Explosion Proof Electric Hard Sealed Butterfly Valve2
Explosion Proof Electric Hard Sealed Butterfly Valve4
Explosion Proof Electric Hard Sealed Butterfly Valve1
Explosion Proof Electric Hard Sealed Butterfly Valve5
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Explosion-Proof Electric Hard-Sealed Butterfly Valve

Metal-to-metal seated butterfly valve for hazardous, flammable, and explosive service. Fast open/close, bubble-tight shutoff, and broad resistance to temperature extremes and corrosion. Suitable for pipeline control of combustible and explosive media.

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Exploded View of Explosion‑proof Electric Hard‑sealed Butterfly Valve

Product Introduction

Metal-seated butterfly valves are a core type in the butterfly valve family, built for demanding service. The seat and disc use metal-to-metal sealing faces that resist high temperature, high pressure, abrasion, and corrosion. The compact body gives low operating torque and simple operation, while low flow resistance delivers high flow efficiency. Designed for steam, hot oil, and corrosive gas service, it provides precise flow and pressure control and is widely used in chemical, power, and metallurgical applications.

Features

  • Stem sealed with molded graphite rings for zero leakage; holds zero leakage under fire exposure and meets fire-safe standards (API 607).
  • Low breakaway torque. The disc's conical sealing face cam-lifts clear of the seat as it opens.
  • Self-cleaning sealing face resists solids build-up; seat elasticity provides sealing on closure.
  • Minimal seat-to-disc friction with a self-tightening seat that seals more reliably as the valve closes.

Basic Parameters

Nominal Diameter (DN): DN15-DN350 (For larger diameters, please contact our company for detailed information)
Nominal Pressure (PN): PN1.6～6.4MPa
Connection Mode: Wafer type connection, Flange connection
Valve Seat Type: Stainless steel movable hard seal
Action Time: 15～120 seconds (0-90°) optional
Working Power Supply: AC110V, AC220V, AC380V, DC24V
Control Mode: Regulating or on-off control
Pneumatic Action Mode: Single acting (with spring return) or double acting
Medium Temperature: ≤450℃
Ambient Temperature: -30～60℃
Dead Band: 0.3%～3.0% adjustable

Material Specifications

Body & Internal Components

Valve Body Material: WCB, SS304, SS316, SS316L
Valve Seat Material: SS304, SS316, SS316L
Valve Core Material: SS304, SS316, SS316L

Applicable Medium

  • Slurry
  • Coal Slurry
  • Paper Pulp
  • Water
  • Oil Products
  • Gas

Explosion Protection

Ex db ⅡC T6 Gb
Flameproof enclosure with increased safety
Explosion Protection
Flameproof (d) + Increased Safety (b)
Gas Group
ⅡC (Hydrogen, Acetylene)
Temperature Class
T6 (≤85°C)
Equipment Protection Level
Gb (Zone 1 & 2)

Standards Compliance

Manufacturing Standard: GB/T 12237-2021
Flange Standard:
- GB/T 9124.1-2019 - GB/T 9124.2-2019 - GB17241.6-2008
Structure Length Standard: GB12221-2005
Inspection Standard: GB/T 13927-2022

Main Parameters

1.Main Technical Parameters and Indicators of Hard-sealed Electric Regulating Valve Body

Nominal Diameter (DN)DN15-DN350 (For larger diameters, please contact our company for detailed information)
Nominal Pressure (PN)PN1.6～6.4MPa
Connection ModeWafer type connection, Flange connection
Valve Seat TypeStainless steel movable hard seal
Action Time15～120 seconds (0-90°) optional
Working Power SupplyAC110V, AC220V, AC380V, DC24V
Control ModeRegulating or on-off control
Medium Temperature≤450℃
Ambient Temperature-30～60℃
Applicable MediumSlurry, coal slurry, paper pulp, water, oil products, gas
Dead Band0.3%～3.0% adjustable
Valve Body MaterialWCB, SS304, SS316, SS316L
Valve Seat MaterialSS304, SS316, SS316L
Valve Core MaterialSS304, SS316, SS316L
Manufacturing StandardGB/T 12237-2021
Flange StandardGB/T 9124.1-2019, GB/T 9124.2-2019, GB17241.6-2008
Structure Length StandardGB12221-2005
Inspection StandardGB/T 13927-2022

Dimension Drawing

1.Explosion-proof Flanged Hard-seal Butterfly Valve Dimension Drawing

Explosion proof Hard sealed Wafer Butterfly Valve Dimension Drawing
Nominal Diameter
（DN）		LD1D24-ΦdH1H2W1W2
504312510518267112217150
654614512518284115217150
805616014018289120217150
1006418016018347138268180
1257021019018352164268180
1507124021522381175268180
2007629527022399208268180
2508335532526449243268180
3009241037526529283268180
35010247043526559310268180
40011452554530570340354273
45012758556530600380354273
50015465059033680410354273
60016577069036750470354273
70019084080536810550354273
80020395091539905640354273
9002161050101539960710354273
100025411701120421010770354273
120026513901335481175890354273

2.Explosion-proof Hard-sealed Wafer Butterfly Valve Dimension Drawing

Explosion proof Flanged Hard seal Butterfly Valve Dimension Drawing
Nominal Diameter
（DN）		LD1D2n-ΦdBCH1H2W1W2
501081251654-Φ18162267112217150
651121451854-Φ18162284115217150
801141602008-Φ18182289120217150
1001271802208-Φ18203347138252163
1251402102508-Φ18223362164252163
1501402402858-Φ22243381175252163
20015229534012-Φ22243399208293184
25016535540512-Φ26263449243293184
30017841046016-Φ26283.5529283293184
35019047052016-Φ30303.5559310293184
40021652558020-Φ30323.5570340354273
45022258564020-Φ33403.5600380354273
50022965071520-Φ36444680410354273
60026777084024-Φ36544750470354273
70029284091024-Φ39404810550354273
800318950102528-Φ39424905640354273
9003301050112528-Φ42445960710354273
10004101170125532-Φ484651010770354273
12004701390148532-Φ485251175890354273

Circuit Diagram

S

S

Switching Action Mode：Switching operations (open/close) are achieved via AC switching signals, and a set of active position signals indicating fully open/fully closed status are output.

MS

MS

Switching Action Mode: Outputs passive contact signals. Structure：Equipped with two intermediate position switches.

PIU

PIU

Switching Action Mode: Outputs 0~1000Ω feedback signal. Structure: Equipped with 500Ω or 1kΩ potentiometer.

CPT

CPT

Switching Action Mode:
Outputs 4~20mA valve position feedback signal. Structure: Equipped with 1kΩ potentiometer and R/I converter.

PCU

PCU

Regulating Action Mode:Accepts 4~20mA control signal input and outputs 4~20mA valve position feedback signal. Structure: Integrated with 1kΩ potentiometer and control module (servo amplifier).

G

G

DC switching signals are output from the circuit via an external DC power supply to control the opening/closing program, and a set of passive contact signals corresponding to fully open/fully closed positions are provided.

SP

SP

Switching Action Mode: 
Controls valve opening angle via switching circuit, corresponding to potentiometer resistance value, while enabling intermediate position control function. Structure: Integrated with potentiometer and intermediate position switch.

H

H

Three-phase AC switching signals are output through an external three-phase power phase-reversing circuit to control opening/closing operations, accompanied by a set of passive contact signals for fully open/fully closed position indication.

Documents & Drawings:

GRAT Hard seal Butterfly Valve Selection Catalog 202606 页面 01
GRAT-Hard-seal Butterfly Valve Selection Catalog
Electric Butterfly Valve Instruction Manual
Electric Butterfly Valve Instruction Manual

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If you have a question or comment,
please email us at [email protected]

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