ORV3 Manifold Supplier for 21-Inch Blind-Mate Racks

PARTS ON THIS PAGE: RH-RM-O21-BM · $9,100 RH-RM-H19-TOR · $5,100 RH-RM-RFX · $5,650 RH-RM-V44-18 · $9,550 RH-RM-V48-HD · $13,600

What an ORV3 rack asks of its manifold

The numbers that matter: 21-inch rack width, OU pitch of 48 mm (against 44.45 mm for a standard EIA U), and common heights of 44 OU and 48 OU. Drop positions have to fall on 1 OU multiples so they line up with whatever tray population the integrator lands on — and that population usually changes between the interface drawing and the install date.

Blind-mate is the part that separates ORV3 work from ordinary rack manifolds. The UQDB couplings sit on floating mounts sized to the radial misalignment allowance in the OCP interface spec, so the coupling can shift enough to self-align as the tray engages. Get the float wrong in either direction and you have a problem: too little and trays bind or seals wear unevenly, too much and the coupling can miss engagement entirely. We machine the coupling bodies and the floating-mount hardware ourselves, which means the manifold, the mounts, and the couplings are toleranced as one assembly rather than three vendors' parts meeting for the first time in your rack.

Why configured-to-order beats a catalog manifold

Most deployments we quote are not clean-sheet ORV3 rows. They are a mix: new 21-inch racks going in next to EIA-310 19-inch cabinets being retrofitted for direct-to-chip, sometimes with a third generation of hardware sharing the same CDU loop. A fixed catalog manifold forces every rack to fit the part number. Configured-to-order runs the other way — we build the ORV3 pairs to your rack vendor's interface drawing, the 19-inch pairs to your elevations, and mixed UQDB04/06/08 drop plans where individual trays pull different flow.

There is no tooling charge for a configuration change, so a 44 OU pair and a 48 OU pair price out on drop count and geometry, not on which one happens to match a stocked design. Rack vendors also differ on bus bar clearances and rear-channel obstructions; building to the actual interface drawing absorbs those differences instead of discovering them at install.

How we build and test them

Headers are 316L stainless tube, orbital-TIG welded. Coupling bodies, drop bosses, and mounting hardware come off our own spindles, with UQD and UQDB geometry machined to the OCP spec. Wetted surfaces are 316L standard; brackets and non-wetted hardware are 304. Seals are EPDM, compatible with PG25 and treated-water loops, and the working pressure class is 150 psi.

After welding, every manifold gets citric passivation per ASTM A967, then a 225 psi hydrostatic test plus a pressure-decay leak check. The test results ship in the crate as a serialized certificate tied to that unit. Parts are cleaned, capped, and bagged for coolant service, so the manifold goes from crate to rack without a separate flush-and-verify cycle on your side.

Reference designs and from-prices

These are starting points, not fixed products — drop count, pitch, OU height, and QD sizes are all configurable, and the firm quote comes back against your actual drawing.

Rack manifold reference designs. From-prices are per supply/return pair.

What to send for a quote

The fastest path to a firm number is your rack vendor's interface drawing, but a rack elevation or even a drop count and pitch is enough to start. Useful details, roughly in order of importance:

• Rack standard and height — ORV3 44 OU or 48 OU, or EIA-310 U count for retrofit pairs
• Drop plan: count per manifold, pitch, and UQDB or UQD size at each position (mixed sizes are fine)
• Coolant (PG25 or treated water) and required working pressure if above the 150 psi class
• For blind-mate work, the tray vendor's coupling positions or the rack interface drawing revision
• Whether the job is greenfield, retrofit, or a mix — it changes how we handle mounting hardware

Common questions