U-Type Marine Concentric Butterfly Valve Introduction

1. Overview

The U-type marine concentric butterfly valve is a wafer-style soft-seated valve designed for shipboard piping systems.
Featuring a U-shaped body groove and a concentric disc-shaft structure, the valve provides reliable shut-off performance, excellent corrosion resistance, and easy installation with marine-standard flanges.
It is widely used for seawater, cooling water, ballast water, fire-fighting, and various utility lines on vessels.

2. Design Characteristics

Concentric Structure (Center-Line Design)
The disc and shaft share the same centerline, providing stable torque, low operating resistance, and tight shut-off.

U-shaped Groove Body
Ensures accurate alignment with JIS / DIN / ANSI marine flanges and enhances sealing integrity.

Soft Seat Sealing
EPDM, NBR, PTFE, or Viton seats deliver excellent sealing performance and low leakage (Bubble-Tight).

Lightweight & Space-Saving
Compact body design is ideal for marine engine rooms and confined piping spaces.

Quick Operation
90° rotation with lever, gear operator, pneumatic actuator, or electric actuator.

Excellent Corrosion Resistance
Common marine materials such as C95400, C95800, CF8M, and duplex stainless steel ensure long service life in seawater applications.

3. Typical Materials

Body: Aluminum Bronze C95400 / C95800/Stainless Steel CF8 / CF8M

Duplex Stainless Steel S31803 / S32750/Ductile Iron with marine epoxy or rubber lining

Disc: C95400 / C95800 / SS316 / SS316L/Duplex Stainless Steel/Ni-plated Ductile Iron

Shaft： SS316/Duplex Steel

Seat: EPDM (recommended for seawater)/NBR (for oil-related media)/PTFE (for corrosive chemical media)/Viton (for high temperature or special fluids)

4. Applications

U-type concentric butterfly valves are commonly used in:

Seawater cooling systems，Ballast water pipelines，Engine room and machinery space piping，Fire-fighting lines，HVAC systems，Fresh water and utility pipelines

Water treatment and bilge systems

5. Applicable Standards

Marine Class Approvals: DNV / ABS / LR / BV / NK / RINA

Face-to-Face: ISO 5752 / EN 558

Flanges: JIS 5K/10K, DIN PN10/16, ANSI Class 150

Actuator Mounting: ISO 5211

Available with EN 10204 3.1 / 3.2 Certificates