Bijur Delimon DD and DM Dual-Line Distributors
The Bijur Delimon DD and DM series are dual-line lubrication distributor valves, fully hydraulic and individually adjustable, for oil or grease. In a dual-line system, two alternating main lines supply the valve sections, and each section reverses and discharges when line pressure switches. This page covers the DD and DM families as the verified selection path for replacement dual-line distributors. For background on how these valves operate within a larger system, see how dual-line distributors fit into centralized lubrication.
Official Specifications
- DD series: maximum working pressure 240 bar, about 3,500 psi.
- DD series: 0.09 to 4.74 cc per piston stroke.
- DD series: two discharge outlets per valve section.
- DD series: a section normally serves two lubrication points, or one point when the two outlets are cross-ported.
- DD series: available configurations cover 1 to 12 outlets.
- DM series: maximum working pressure 240 bar, about 3,500 psi.
- DM series: 0.19 to 13.11 cc per piston stroke.
- DM series: one discharge outlet per valve section, located on the underside.
- DM series: for single-outlet sections and larger metered volumes.
- DM series: available configurations cover 1 to 4 outlets.
- DM series: four supply ports.
Model Ranges and Screw Adjustment
- DD-2X: 0.09 to 0.59 cc per piston stroke, adjustment 0.03 cc per screw revolution.
- DD-5X: 0.18 to 4.74 cc per piston stroke, adjustment 0.18 cc per screw revolution.
- DM-3X: 0.19 to 1.18 cc per piston stroke, adjustment 0.08 cc per screw revolution.
- DM-4X: 0.59 to 2.21 cc per piston stroke, adjustment 0.11 cc per screw revolution.
- DM-5X: 1.23 to 5.01 cc per piston stroke, adjustment 0.16 cc per screw revolution.
- DM-6X: 2.95 to 13.11 cc per piston stroke, adjustment 0.64 cc per screw revolution.
The per-revolution adjustment value tells you how much the metered volume changes with each full turn of the adjustment screw. This lets you set the discharge volume within the model range to match the lubrication point requirement.
DD or DM: Two Outlets or One
A DD section has two discharge outlets, so it normally serves two lubrication points that sit close together. When the two outlets are cross-ported, one DD section serves a single point with the combined output. A DM section has one bottom outlet and is the correct choice when a single point needs a larger metered volume per stroke. Choose DD when two nearby points can share a section and smaller volumes are sufficient. Choose DM when one point requires a larger volume or when the outlet must be on the underside.
The DDM Family and the DDN Question
Official Bijur Delimon material lists the DDM-SDM family as a modular dual-line distributor family with 1 or 2 outlets and a discharge range of 0.1 to 30 cc. Individual DDM model tables beyond that are not verified from the retrieved official pages. DDN does not appear in the retrieved official Bijur Delimon documentation, so this page states no DDN specifications. The retrieved official catalog pages do not publish body materials, seal compounds, or temperature ranges for DD and DM. Confirm those details from the dimensional sheet or quotation before ordering.
Where They Fit and Ordering Practice
DD and DM valves operate in dual-line systems where two main lines alternate pressure and each valve section reverses on every switch. For system-level guidance, see dual-line lubrication systems. Control timing in these systems often comes from a device such as the SM-AC control timer. Before ordering, confirm the model line such as DD-2X style, the outlet count, the cc range needed, and whether cross-porting is required. This page covers aftermarket dual-line distributors, not manufactured, sponsored, or endorsed by Bijur Delimon. Contact the quotation team with those four details to start a replacement valve order.
Frequently Asked Questions
What are the Bijur Delimon DD and DM series?
They are dual-line distributor valves that are fully hydraulic and individually adjustable. The valves are designed for oil or grease in centralized lubrication systems.
What is the maximum working pressure?
The maximum working pressure for both DD and DM series is 240 bar. That rating is about 3,500 psi.
What discharge volumes do DD valves cover?
DD valves cover 0.09 to 4.74 cc per piston stroke. The exact range depends on the specific DD model line.
What discharge volumes do DM valves cover?
DM valves cover 0.19 to 13.11 cc per piston stroke. The exact range depends on the specific DM model line.
What is the difference between DD and DM?
DD valve sections have two discharge outlets, while DM sections have one bottom outlet. DM valves also support larger metered volumes per section.
What does cross-porting a DD section do?
Cross-porting combines the two outlets of a DD section into one discharge point. This lets one section serve a single lubrication point.
How is the discharge volume adjusted?
Each valve uses an adjustment screw to set the discharge volume. The cc change per screw revolution depends on the model line.
What is the DDM-SDM family?
The DDM-SDM family is a separate modular dual-line distributor family. Official material lists 1 or 2 outlets and a 0.1 to 30 cc range.
Can this page confirm DDN specifications?
No. DDN does not appear in the retrieved official documentation, so ask for the current catalog sheet at quotation.
Who builds and supports these units?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
Contact the quotation team for current availability and dimensional confirmation. Bijur Delimon is a trademark of its respective owner. This page covers aftermarket dual-line distributors, not manufactured, sponsored, or endorsed by Bijur Delimon. DD, DM, DDM, and DDN are Bijur Delimon designations shown for cross-reference identification only.
