300PSI Butterfly Valve with Gearbox - Grooved End GD-381G

Name: 300PSI Butterfly Valve with Gearbox - Grooved End GD-381G
Brand: Ningjin APC Industries
SKU: GD-381G
Availability: InStock

Date Updated: July 28, 2026
Prepared by: Fire Gate Valve Technical Department

Categories:

Butterfly Valve

Compliance Credentials: Strictly certified to UL 260 and FM standards for high-hazard critical infrastructure

Butterfly Valve with Gearbox-Grooved End

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300PSI Butterfly Valve with Gearbox - Grooved End GD-381G

▏Product Description

The GD-381G grooved end fire protection valve is engineered by Ningjin APC Industries specifically to meet the demanding requirements of modern high-rise building standpipes, commercial fire sprinkler loops, and industrial fire protection infrastructure. Designed for rapid mechanical assembly and long-term tight shutoff, this high-performance butterfly valve with pressure ratings conforming to UL and FM standards combines a robust clear waterway geometry with an integrated heavy-duty gearbox operator for effortless manual control and precise flow regulation.

Crafted with a high-strength ductile iron body and protected by a durable fused epoxy finish, the GD-381G provides superior resistance to corrosion and environmental wear in both indoor and outdoor fire protection systems. The disc design features complete resilient EPDM encapsulation, ensuring bubble-tight sealing and reduced torque across severe pressure fluctuations up to 300 PSI. Dual 416 stainless steel shafts and heavy-duty PTFE/C95400 stem bushings provide structural strength against hydraulic shock, eliminating shaft deflection during emergency operations.

To streamline installation for EPC contractors and MEP engineers, the GD-381G features grooved ends conforming to ANSI/AWWA C606 and metric connection standards, significantly reducing field installation labor compared to traditional flanged valves. Furthermore, the unit features an ISO 5211 top flange mounting pattern, allowing seamless attachment of supervisory tamper switches or electric/pneumatic actuators when automated fire suppression monitoring is specified.

▏Specifications & Engineering Data

Parameter	Technical Requirement / Value
Product Model	GD-381G
Valve Type	Butterfly Valve with Gearbox Operator
Nominal Sizes	2", 2½", 3", 4", 5", 6", 8", 10", 12" (DN50 - DN300)
Working Pressure Rating	300 PSI (2.1 MPa / 21 Bar)
Shell Hydrostatic Test Pressure	600 PSI (4.2 MPa / 42 Bar)
End Connection Standard	Grooved End conforming to ANSI/AWWA C606 or Metric Standard
Design & Testing Certifications	Conforms to UL 1091, ULC / ORD-C1091, FM 1112; Optional NSF/ANSI 61 & NSF/ANSI 372
Top Flange Mounting Standard	ISO 5211 Direct Mounting Pattern
Working Temperature Range	0°C to 80°C (32°F to 176°F)
Body Material	Ductile Iron (ASTM A536 65-45-12 / EN-GJS-450-10)
Disc Material	Ductile Iron fully encapsulated in EPDM rubber
Upper & Lower Shaft Material	416 Stainless Steel (ASTM A582)
Bushings & Bearings	PTFE / Commercial Bronze C95400
Coating Finish	Electrostatically Applied Fusion Bonded Epoxy (FBE) Coating
Application Media	Fire Protection Water, Sprinkler Main Lines, Potable Water Lines

▏FAQ

Q1: Does the GD-381G grooved end butterfly valve with gearbox meet international fire protection standards UL 1091 and FM 1112?

Yes. The 300PSI butterfly valve with gearbox GD-381G features pressure ratings that strictly conform to UL 1091, ULC / ORD-C1091, and FM 1112 engineering specifications. Built with a 300 PSI maximum working pressure rating and tested up to 600 PSI, it ensures reliable flow shutoff in high-rise building standpipes and industrial fire protection loops.

Q2: What materials are used for the stem and disc seal in the GD-381G grooved fire butterfly valve?

The GD-381G valve body is constructed from durable ductile iron paired with an upper shaft and lower shaft made of 416 stainless steel. The sealing disc is constructed from ductile iron completely encapsulated in resilient EPDM rubber, providing bubble-tight shutoff across a working temperature range of 0~80°C (32~176°F).

Q3: Is the GD-381G grooved butterfly valve suitable for dual fire protection and potable drinking water application?

Yes. While primarily designed for fire inflow water and drain pipe lines, certified lead-free options conforming to NSF/ANSI 61 and NSF/ANSI 372 standards are available upon request for potable water installations.

Q4: What pipe connection sizes and face-to-face dimensions are available for GD-381G grooved butterfly valves?

The GD-381G model comes in nominal pipe sizes ranging from 2" to 12" (2", 2½", 3", 4", 5", 6", 8", 10", 12"). All sizes utilize grooved end connections conforming to ANSI/AWWA C606 or metric standard specifications, ensuring rapid and secure piping installation.

Q5: Can an ISO 5211 supervisory tamper switch or actuator be integrated onto the GD-381G valve top flange?

Yes. The valve top mounting flange standard strictly adheres to ISO 5211, enabling straightforward mounting of gearboxes, supervisory signal switches, and electric or pneumatic actuators without structural modifications.

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