Technical selection
Specifications and configuration
Reference — MQD series
| Parameter | Documented value / configuration |
|---|---|
| Engagement mechanism | Steel-pin locking with direct insertionConditions: scope: manufacturer series description, not a cross-brand mating standard |
| Listed working pressure | 0 to 100 psiConditions: scope: series statement; exact order code, fluid and temperature must be verified |
| Listed temperature range | -40 to 110 degCConditions: scope: not a combined pressure-temperature-coolant operating envelope |
| Size specific recommended flow | MQD02 2.1; MQD03 4.6; MQD04 8.5; MQD04 MINI 8.5 L/minConditions: scope: separate model rows, water at 20 degC, plug-to-socket direction, manufacturer 5 m/s velocity criterion; not one family flow range |
| Size specific socket plug end examples | For MQD02, the catalog lists socket MQD02-1432-U716 with UNF 7/16-20 and plug MQD02-7434-P7 with a 7 mm end; these are separate matching-half examples, not a universal MQD portConditions: scope: Order specific; confirm half pairing, mating drawing and tube/hose connection |
| Listed shell and seal options | MQD technical summary lists SUS316L shell and EPDM or FVMQ sealing-ring optionsConditions: scope: Series-listed options; verify actual wetted set and coolant compatibility by order code |
Manufacturer series reference. Confirm the exact order code, mating parts and stated conditions for the quoted configuration.
Overview
This manually serviceable MQD-style connector uses direct insertion and a steel-pin locking concept. Its engagement is distinct from an externally retained blind-mate interface and from ball-locking hand couplings.
Construction and interfaces
The pictured manufacturer rendering shows an individual quick-coupling half with a compact body, visible red retention region and an end connection. A complete installation still requires the correctly matched socket and plug order codes.
Selection
The manufacturer reports separate recommended-flow rows for MQD02, MQD03, MQD04 and MQD04 MINI under water-at-20-degree test conditions. Compare the correct row and pressure-drop curve; do not use a single family-wide flow rating.
Configuration options
Select the exact size, socket/plug combination, end thread or tube connection, material and seal. The catalogue also depicts right-angle plug configurations, which require distinct installed-clearance and ordering checks.
Application limits
The listed pressure and temperature summaries are manufacturer-series statements, not a combined rating for every coolant and seal. The reference image has no visible order code and cannot establish its exact size.
