Hydraulic Support Cylinder RFQ Checklist for OEM Buyers

An accurate hydraulic support cylinder quotation requires controlled dimensions, operating pressure, load information and underground duty conditions. OEM manufacturers, mining-equipment service teams and distributors should submit one data package per cylinder function rather than relying on a general machine model.

Identify the Cylinder Function First

State whether the cylinder is used as a column, push jack or another function within a hydraulic roof support. Describe where it is installed, what it moves or supports, the critical load direction and whether the request is for a new OEM design or a replacement. The verified product scope is hydraulic supports for coal mines.

Minimum Dimensional Information

• Bore and rod diameter, including units and drawing tolerances.
• Stroke, retracted length, extended length and pin-to-pin dimensions.
• Base-end and rod-end mounting geometry, pin diameters and mounting widths.
• Port size, thread, orientation and clearance around hoses and fittings.
• Installation envelope and any interference limits through the complete movement.
• Drawing number, revision and quantity for each distinct cylinder function.

Operating Data the Supplier Needs

• Normal working pressure and known peak or shock-pressure conditions.
• Maximum pull load, load direction and the machine geometry that produces it.
• Extension and retraction speeds, cycle frequency and pressure-holding duty.
• Ambient temperature and exposure to coal dust, moisture, mud or corrosive contamination.
• Hydraulic-fluid information supplied by the equipment owner.
• Required inspection, pressure-test records, marking and packaging instructions.

Verified Product-Family Range

These values define the verified range of the product family. They do not confirm that every maximum can be combined in one cylinder. Final feasibility depends on geometry, load direction, pressure, stroke, mounting and the complete duty cycle.

Liste de contrôle pour la mesure du cylindre de remplacement

Use the original controlled drawing whenever available. If it is missing, measure the safely isolated cylinder and record every interface. Photograph the complete unit, nameplate, rod end, base end, ports and installed orientation. Separate the intended design from wear or damage: a bent rod, elongated pin bore or distorted mount should not become the replacement specification.

Underground Environment Details

The verified product description specifies a high-strength tube, wear-resistant piston rod and dust-proof, anti-corrosion sealing kits for high-pressure, dusty underground service. Buyers should still describe the actual contamination, temperature and pressure-holding conditions. That information allows the engineering review to address the intended mine duty rather than a generic hydraulic-cylinder assumption.

Commercial Details That Prevent Requoting

• Prototype quantity and expected production quantity.
• Delivery destination and required timing.
• Whether the buyer must approve a drawing before manufacture.
• Required inspection documents and acceptance criteria.
• Packing and corrosion-protection expectations for transport and storage.

Common RFQ Errors

Using only the roof-support model

Machine model information is helpful but may not identify revisions or individual cylinder functions. Add a drawing or complete measurements.

Providing pressure without load geometry

Pressure alone does not define the required cylinder. Include load direction, mounting and the mechanism that transfers force.

Copying values from a similar cylinder

Do not fill missing fields with another support model. Mark unknown values and provide the evidence that is available.

FAQ

Can Zhenqiang customize from a customer drawing?

Yes. The verified product record states that OEM and ODM customization is available according to customer drawings, with strict pressure testing before shipment.

Is the published range a design recommendation?

No. It is a manufacturing-range reference. The supplier must review the complete application before confirming a design.

See the broader Programme de vérin hydraulique Zhenqiang before preparing your RFQ package.