Upper Plate / Fixed Plate: Temperature Range -20°C to 400°C

Component Specifications

Definition

The Upper Plate, also known as Fixed Plate, is a critical structural component in slide gate or stopper rod flow control devices used in industrial processes. It serves as the stationary mounting surface that anchors the device to the pipeline or vessel, providing a rigid foundation for the moving components. This plate maintains precise alignment, ensures proper sealing against the sliding gate or stopper, and withstands operational pressures and thermal stresses.

Working Principle

The Upper Plate functions as the fixed reference plane in flow control mechanisms. It remains stationary while the sliding gate or stopper rod moves against its surface to regulate material flow. The plate's flatness and surface finish ensure tight sealing when the gate is closed, while its mounting holes and alignment features maintain precise positioning relative to the flow path.

Materials

Typically manufactured from carbon steel (ASTM A36), stainless steel (304/316), or wear-resistant alloys. Surface treatments may include hard chrome plating, nitriding, or ceramic coating for enhanced wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	20-50 mm
Surface Finish	Ra 0.8-1.6 μm
Pressure Rating	Up to 1500 psi
Temperature Range	-20°C to 400°C
Flatness Tolerance	±0.05 mm
Mounting Hole Pattern	ASME B16.5 flange compatible

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, ASME B16.5, DIN 2501

Parent Products

This component is used in the following industrial products

Flow Control Device (Slide Gate or Stopper Rod)

A device used to regulate the flow of molten steel from the tundish to the mold during continuous casting.

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Engineering Analysis

Risks & Mitigation

Surface wear leading to leakage
Thermal distortion affecting flatness
Corrosion in aggressive environments
Fatigue cracking at mounting points

FMEA Triads

Trigger: Abrasive material flow
Failure: Surface erosion and increased clearance
Mitigation: Apply hard-facing coatings and implement regular surface inspection

Trigger: Thermal cycling
Failure: Warping and loss of flatness
Mitigation: Use materials with matched thermal expansion and incorporate cooling channels

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flatness within 0.05 mm, parallelism within 0.1 mm, surface roughness Ra ≤ 1.6 μm

Test Method

Surface plate inspection, coordinate measuring machine (CMM), pressure testing per ASME B16.34

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Upper Plate / Fixed Plate

Manufacturer profiles associated with Upper Plate / Fixed Plate.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between Upper Plate and Lower Plate in flow control devices?

The Upper Plate is stationary and provides mounting/sealing surface, while the Lower Plate typically moves with the gate mechanism or serves as a wear plate.

How often should Upper Plates be inspected for wear?

Inspect every 6-12 months depending on service conditions. Check for surface scoring, flatness deviation, and seal groove integrity.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Upper Plate / Fixed Plate