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Gate/Disc Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

The Gate/Disc is a critical component in gate valves and similar regulation valves, consisting of a flat or wedge-shaped plate that slides between two parallel seats. It operates by moving perpendicular to the fluid flow direction, either fully opening to allow unrestricted flow or fully closing to create a tight seal. This component is designed for on/off service rather than throttling, providing minimal pressure drop when open and reliable shut-off when closed. Its precise machining and material selection ensure compatibility with various fluids, pressures, and temperatures in industrial applications.

Working Principle

The Gate/Disc operates on a linear motion principle where it moves perpendicular to the flow path. When the valve stem rotates, it converts rotational motion into linear motion through threads, raising or lowering the gate/disc. In the open position, the gate/disc retracts completely into the valve bonnet, creating an unobstructed flow path. In the closed position, it seats firmly against two parallel sealing surfaces, creating a metal-to-metal or soft-seated seal that prevents fluid passage. The wedge-shaped design provides self-energizing sealing as system pressure increases.

Materials

Common materials include ASTM A216 WCB (carbon steel), ASTM A351 CF8/CF8M (stainless steel 304/316), ASTM A494 CW-6MC (Hastelloy C), and ASTM B62 (bronze). Sealing surfaces may be hardened through stellite overlays (6-12% cobalt-chromium-tungsten alloy) or have PTFE/elastomer inserts for soft-seated applications. Material selection depends on fluid compatibility, temperature range (-29°C to 425°C typical), pressure rating (PN10 to PN100), and corrosion resistance requirements.

Technical Parameters

Seat Type Metal-seated or Resilient-seated
Stem Type Rising or Non-rising
Face-to-Face ISO 5752, API 600
Leakage Class API 598, ISO 5208 Rate A to D
End Connections Flanged (ISO 7005), Threaded (ISO 7-1), Welded
Pressure Rating PN16 to PN100 (ANSI 150 to 600)
Temperature Range -29°C to 425°C

Standards

ISO 5208, API 600, API 598, ASME B16.34, ISO 5752

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Gate/Disc.

Parent Products

This component is used in the following industrial products

Regulation Valve/Gate

A flow control component within a feed regulator system that modulates material passage.

View Product Details

Engineering Analysis

Risks & Mitigation

Seat and disc galling in metal-seated valves
Stem packing leakage
Gate/disc erosion from high-velocity fluids
Corrosion in chemical applications
Thermal expansion mismatch causing binding

FMEA Triads

Trigger: Improper material selection for fluid service
Failure: Rapid corrosion or erosion of gate/disc surfaces
Mitigation: Conduct material compatibility analysis per ASTM G31, select corrosion-resistant alloys, apply protective coatings

Trigger: Inadequate lubrication of stem threads
Failure: High operating torque leading to stem deformation or seizure
Mitigation: Implement preventive maintenance schedule with high-temperature anti-seize compounds, monitor torque values

Trigger: Solid particle contamination in fluid
Failure: Scoring of sealing surfaces causing leakage
Mitigation: Install upstream filtration (100 micron minimum), use hard-faced seating surfaces (stellite overlay)

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Seating surface flatness: 0.0005 in/in, Stem straightness: 0.001 in/ft, Bore concentricity: 0.002 TIR

Test Method

Hydrostatic shell test at 1.5x rated pressure, seat leakage test per API 598 with test medium appropriate to service

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between wedge gate and parallel slide gate designs?

Wedge gates have tapered discs that provide self-energizing sealing as pressure increases, while parallel slide gates have two parallel discs with spring mechanisms that maintain sealing force regardless of pressure fluctuations.

How often should gate/disc components be inspected?

Inspect annually for wear, corrosion, and sealing surface damage. Replace if leakage exceeds API 598 standards or if erosion reduces sealing surface by more than 20%.

Can gate valves be used for throttling applications?

No, gate valves are designed for full open or full close service only. Throttling causes vibration, cavitation, and premature wear of the gate/disc sealing surfaces.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Gate/Disc