Products

JM Type Diaphragm Coupling

JM Type Diaphragm Couplings transmit torque between shafts while accommodating specified misalignment. Their lubrication-free design eliminates the need for grease lubrication, but regular inspection of alignment, fasteners, and diaphragm condition is still required.

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Product Introduction

Technical Specifications

Final operating limits must be confirmed against the selected model's technical documentation.

Parameter	Specification
Torque Range	50–50,000 N·m
Bore Diameter	10–250 mm
Operating Temperature	−40°C to +280°C
Maximum Speed	Up to 10,000 rpm
Angular Misalignment	Up to 0.5°
Parallel Misalignment	Up to 0.2 mm
Axial Displacement	Up to 1 mm

Diaphragm Configuration, Installation and Operation

Installation and Alignment

Verify shaft dimensions and installation space before assembly.
Align shafts within the selected coupling's specified misalignment limits.
Tighten fasteners according to the assembly instructions.

Operating Checks

Inspect for abnormal vibration, loose fasteners, or diaphragm damage.
Recheck alignment after equipment movement or abnormal vibration.
Stop operation if cracks or visible damage are found.

Applications

Centrifugal Pumps: Connect electric motors to pump shafts according to torque, speed, and shaft requirements.

Industrial Compressors: Support drive connections requiring appropriate torsional stiffness and dynamic balance.

Fans and Blowers: Transmit power while accommodating allowable shaft misalignment.

Gearboxes and Industrial Drives: Connect motors, gearboxes, and driven machinery according to application requirements.

Selection and Replacement Guide

New Equipment Selection
To identify a suitable coupling, provide:
Required torque and operating speed
Driving and driven shaft diameters and keyway dimensions
Expected angular, parallel, and axial displacement
Available installation space and operating conditions

Existing Coupling Replacement
For replacement, provide:
Existing model number, nameplate, or technical drawing
Bore, keyway, hub, and overall dimensions
Required torque and operating speed
Photos of the existing coupling and shaft connections, if available

The selected coupling must meet the application's operating and installation requirements.

Next Step: Submit your technical requirements or drawings for model matching and quotation.

Customization and Order Confirmation

JM Type Diaphragm Couplings can be customized according to specified shaft dimensions, torque, operating speed, misalignment, and installation requirements.

Customization Process
• Technical Review: Confirm the required configuration and agreed technical specifications.
• Drawing Approval: Review and approve applicable drawings before production.
• Change Control: Review and approve any changes to confirmed drawings or specifications before implementation.

Manufacturing and Quality Inspection

JM Type Diaphragm Couplings are manufactured and inspected according to the applicable technical specifications and agreed order requirements.

Manufacturing Stage	Key Inspection Items
Hub Machining	Bore diameter, keyway dimensions, mounting interfaces, and critical tolerances
Diaphragm Fabrication	Specified material, thickness, hole pattern, and visible defects
Assembly	Component fit, fastener installation, and assembly dimensions
Dynamic Balancing	Compliance with the balancing requirements specified for the selected model
Final Inspection	Critical dimensions, assembly condition, and agreed order requirements

Quality Documents

The following documents can be agreed upon during order confirmation, depending on the product configuration and inspection arrangements:
Dimensional inspection report
Material certificates for specified components
Dynamic balancing report, where applicable
Final inspection report

Ordering, Lead Time and Packaging

Lead Time: Typically 20–30 working days for standard models. Confirm the delivery schedule when placing the order.

Stock Availability: Common bore sizes may be available from stock. Confirm availability before ordering.

Packaging: Rust protection, cushioned packaging, and plywood export cases, as applicable to the order and shipping requirements.

Shipping: Air and sea freight options are available, subject to destination and shipment arrangements.

Applications

FAQ

Q: Does a JM Type Diaphragm Coupling require special installation tools?

A: Standard assembly tools may be sufficient, but suitable alignment equipment and torque-controlled tools may be required depending on the coupling design and installation procedure.

Q: What are common signs of diaphragm coupling failure?

A: Visible diaphragm cracks, unusual vibration, abnormal noise, or loosened fasteners may indicate a problem. Stop the equipment for inspection if damage or abnormal operation is detected.

Q: How should diaphragm couplings be stored before installation?

A: Store couplings in a clean, dry environment away from moisture, corrosive chemicals, and mechanical impact. Keep protective packaging in place until installation where practical.

Q: Can a JM Type Diaphragm Coupling be used in corrosive environments?

A: Suitability depends on the diaphragm and hub materials, surface protection, and the specific chemicals or environmental conditions involved. Confirm material and corrosion-protection requirements before ordering.

Q: What factors affect diaphragm coupling service life?

A: Service life is influenced by cyclic loading, start-stop frequency, vibration, alignment, temperature, and operating conditions. Correct installation and timely inspection help reduce premature fatigue and damage.

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