Choke Mechanism: Adjustment Range 0-50 mm

Component Specifications

Definition

The choke mechanism is a critical flow-control component in continuous screw presses for oil extraction, typically consisting of an adjustable conical or tapered restriction at the discharge end. It regulates backpressure within the press barrel by creating a variable orifice, controlling material residence time, compression ratio, and final oil yield. This adjustable restriction allows operators to optimize extraction efficiency for different oilseed types and moisture contents while preventing mechanical overload.

Working Principle

Operates by creating an adjustable annular gap between a conical choke cone and the press barrel discharge housing. As the choke cone moves axially via a threaded adjustment mechanism or hydraulic actuator, the gap size changes, altering resistance to material flow. This modulates internal pressure (typically 20-100 bar) and compression force on the oilseed cake, directly affecting oil expression efficiency and residual oil content in the cake.

Materials

High-chrome alloy steel (e.g., AISI 420, D2 tool steel) with surface hardening (HRC 55-60) or tungsten carbide coatings for wear resistance. Sealing surfaces often use bronze or polymer wear rings. Fasteners: Grade 8.8 or higher corrosion-resistant steel.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Actuation	Manual handwheel, electric, or hydraulic
Repeatability	±0.1 mm
Connection Type	Flanged (ISO 6162) or threaded
Adjustment Range	0-50 mm
Temperature Range	20-150°C
Max Operating Pressure	120 bar

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 1219, DIN 24340, ISO 6162

Parent Products

This component is used in the following industrial products

Continuous Screw Press for Oil Extraction

Industrial machine for continuous mechanical extraction of oils from oilseeds and nuts.

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Engineering Analysis

Risks & Mitigation

Wear from abrasive materials leading to pressure loss
Material bridging causing flow interruption
Over-tightening damaging threads or cones
Thermal expansion affecting gap precision

FMEA Triads

Trigger: Abrasive oilseed particles
Failure: Erosion of choke cone and barrel surfaces
Mitigation: Use hardened materials or coatings; implement regular wear inspection schedules

Trigger: Improper adjustment or operator error
Failure: Excessive pressure causing mechanical failure
Mitigation: Install pressure relief valves; provide operator training; use position indicators

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm on critical sealing surfaces, ±0.2 mm on overall dimensions

Test Method

Pressure decay test at 1.5x operating pressure, material compatibility test with food-grade oils

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

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Manufacturers of Choke Mechanism

Manufacturer profiles associated with Choke Mechanism.

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Frequently Asked Questions

How does choke adjustment affect oil extraction efficiency?

Tighter choke settings increase backpressure, extending material residence time and improving oil yield but raising mechanical load and temperature. Optimal settings balance yield with press capacity and cake quality.

What maintenance is required for choke mechanisms?

Regular inspection for wear on sealing surfaces, lubrication of adjustment threads, cleaning of material buildup, and checking for hydraulic leaks if hydraulically actuated. Replace wear rings annually under continuous operation.

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.

Choke Mechanism