Double-Disc Gate Valve

Product Advantages

● Long Service Life: Reduced wear due to sliding action and automatic sealing adjustment.
● Stable Performance: Consistent sealing even under low differential pressures.
● Ease of Maintenance: Simple seat/disc replacement and compact structure.
● Versatile Application: Suitable for clean water, air, oil, steam (low/medium pressure), and industrial media.
● International Standard Compliance: Designed and tested to EN, ASME, and API requirements.

Size Range

● NPS 1″ – 40″ / DN25 – DN1000

Pressure Rating

● Class 150
● Class 300
● PN10
● PN16
● PN25
● PN40

Standards

● Design Standard: EN 1984 / API 600 / ASME B16.34
● Test Standard: EN 12266 / API 598
● Flange Standard: EN 1092-2 / ASME B16.5 / ASME B16.47

Industry Applications

● Municipal and industrial water supply systems
● Water treatment and distribution pipelines
● Power plant auxiliary pipelines
● Industrial fluid pipelines
● Irrigation and large-diameter water networks
● Air, gas, oil (low/medium pressure) systems

FAQs

1. How does a double disc design achieve tighter sealing than a single wedge disc?
The two discs slide down together, then a wedging mechanism forces them apart against their individual seat rings — because each disc seats independently, minor misalignment or wear on one side doesn’t compromise the seal on the other, which a single-wedge design can’t self-correct for.

2. What’s the practical benefit of “self-compensation” as the seat wears over time?
As the disc and seat surfaces wear from repeated cycling, the expanding mechanism continues to press the discs fully against the seat rather than leaving a growing gap — this extends the interval before the valve needs reseating or disc replacement compared to a fixed-geometry wedge.

3. Rising stem or non-rising stem — which should I choose?
A rising stem gives a visible external indication of open/closed position, useful where operators need a quick visual check; a non-rising stem keeps overall installed height lower, which matters in confined vaults, underground chambers, or buried service where headroom above the valve is limited. See our full breakdown of NRS vs. OS&Y gate valve differences if space and visual verification both matter for your project.

4. Is this valve suitable for throttling flow, or shutoff only?
Shutoff only — like other gate valve designs, running it partially open for extended throttling accelerates disc and seat wear well beyond what the self-compensating mechanism is meant to offset.

5. Can this valve be automated with an actuator instead of the handwheel?
Yes — the same body typically accepts gear operators, pneumatic, or electric actuators for remote or automated operation, though torque requirements should be confirmed against the specific size and pressure class before sizing an actuator.