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5420 Series

High-Performance Butterfly Valve

5420 Series


Chemicals, petroleum oil, high-pressure steam, high-pressure fluids


Lever, gear, cylinder, electric motor
○ Max. service pressure: 2.0Mpa
○ Piping flanges: JIS 10K, 16K, 20K; ASME 125Lb, 150Lb
○ Production size: 50 A to 600 A

Max. service pressure of 2.0 MPa thanks to OKM’s proprietary mechanism
High-performance service temperature of -50°C to 400°C
Self-sealing mechanism ensures tight shutoff
OKM has developed a new mechanism that ensures close contact for both the fluid and the seat depending on the fluid pressure applied to the disc and seat. A higher fluid pressure results in a firmer seal, allowing for even greater reliability. Even in situations where bi-directional pressure is applied from both sides, the structure ensures that the fluid and the seat remain in close contact.
Long service life and low torque eccentric, double-flanged structure
The eccentricity of both A and B is designed to keep the disc and seat in a non-contact state until fully closed. This eccentric, double-flanged structure provides two notable benefits.

1. Eccentric, double-flanged disc structure

The reduced friction between the main unit seat and the disc means a longer service life of the seat in addition to operation with minimal torque.

2. Extremely simple seat replacement

Removing the valve-side set pin of the set ring allows the seat to be removed, enabling simple on-site seat replacement.
Three seat variations for wider support
The seat is available in three different variations: a synthetic rubber seat, a Teflon® seat, and a metal seat. This allows for usability with a wide range of fluids and control conditions—from slurry sludge and chemicals to high-pressure steam.

1. Synthetic rubber seat

With support for controlling high-temperature fluids up to 150°C as well as abrasive sand-like fluids, this seat is perfect for general-purpose butterfly valves.

2. Teflon® seat

The Teflon® seat adds usability with highly corrosive chemicals and high-temperature fluids up to 232°C.

3. Metal seat

The metal seat can be applied to high-temperature fluids that cannot be controlled using rubber or Teflon® seats. Such seats can also be used as a substitute for gate valves, globe valves, and ball valves.