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PRODUCTS / Special Butterfly valves

Jeongdo Machinery’s Inflatable Seated Butterfly Valve is an optimal solution designed for piping systems transporting dry air or powder, and for processes requiring frequent actuation.
It offers excellent sealing performance and reliable operation under demanding conditions.

This valve uses compressed air from a pneumatic actuator to inflate the seat, enabling a precise sealing mechanism through the expansion and contraction of the seat. It is designed to maintain a uniform pressure distribution inside the valve, ensuring outstanding sealing performance.

Option 1. LIP SEAL (reinforced PTFE) is applied inside the seat
Designed to further enhance sealing performance and completely block the ingress of metallic foreign particles from the outside.
Option 2. Pinless Design
Designed with a pinless structure, the valve eliminates friction during disc operation, thereby preventing the generation and ingress of fine metallic particles caused by metal-to-metal contact. This design ensures more stable and contamination-free system operation.

How it works (Open to Close)

OPEN CLOSE (UNSEALED) CLOSE (SEALED)

    Features

    • Longer valve life

      - Less Friction
      - Minimal seat wear

      After the disc rotates, the air is supplied to inflate the seat. The operation method enable no friction occurs between the seat and the disc, damage and wear of the seat are minimized, and the vavle has the longer life cycle.

    • High sealing performance

      - Even pressure distribution

      As a product using air pressure, it distributes the pressure equally inside the seat and has excellent sealing performance.

    • Disc designed to prevent material buildup

      The disc with a streamlined shape minimizes the accumulation of powders and sludges in the pipe line.

    • Lower actuator costs

      - Ultra-low torque requirements

      Since the torque generated when rotating the disc is low, a smaller actuator can be applied, which enables cost reduction

TECHNICAL SPECIFICATIONS

Design Standards
Design Standards
Valve Design API 609 Category A
ASME B16.34
MSS-SP 67
Flange Drilling KS 10K, ASME B16.5, EN 1092
Face to Face API 609
Specfication
Specfication
Body Type Wafer
Size 1 1/4 " ~ 24"
Flange Connection KS 10K, ASME 150
PN 10
Temperature Range EPDM (-20℃~120℃)
NBR (-10℃~80℃)
Silicone (-10℃~150℃)
Max. Allowable Pressure Full Vaccum to 7 bar
Air Supply Max. 8 Bar to Seat
Operator Pneumatic actuator
Material Option
Material Option
Body Aluminum Alloy
A351-CF8 / CF8M / CF3M
DISC A351-CF8 / CF8M / CF3M
Monel, Duplex
Stem SS420
SS316 / SS630 (17-4PH)
Seat EPDM
NBR
Silicone

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