Capabilities · Sealing

Sealing technology from -55 to +200°C.

The elastomer is the only wear part in a dry-break coupling. DryLink builds UQD sets on EPDM as standard and offers FKM, FVMQ, NBR and HNBR — a -55 to +200°C qualification span matched to your coolant, from DOWFROST LC 25 to JEFFCOOL ISF-25 chemistry.

Macro view of EPDM seal rings and the machined valve seat inside a UQD coupling

Seal Engineering

One compound never fits every loop.

OCP UQD Rev 1.0 qualifies wetted materials against DOWFROST LC 25 and JEFFCOOL ISF-25 and references IEC 62368-1 Annex G.15 for coolant-contact safety. Inside that envelope, temperature does the deciding: a warm-water loop at 90°C and a glycol loop at 45°C need different elastomers, and no single compound covers both without compromise.

EPDM is the DryLink standard for water-glycol service from -40 to +120°C. Where the loop runs hotter, FKM extends the ceiling to +200°C; where transport and cold starts dominate, FVMQ keeps its flexibility down to -55°C. NBR and HNBR close the gap for cost- and abrasion-driven builds.

-40 to +120°C — EPDM standard service window
DOWFROST / JEFFCOOL — coolant families the seal pack is qualified against
IEC 62368-1 G.15 — safety clause referenced for coolant-contact materials

Seal Selection Table

Five compounds, one qualification baseline.

Use the temperature rows to shortlist, then let the coolant and cycle count confirm. Every row below is part of the batch documentation we ship.

Seal parameter	Value / Range	How it is applied
EPDM — standard	-40 to +120°C	default seal for water-glycol UQD loops
FKM — option	-15 to +200°C	elevated-temperature and glycol-free service
FVMQ — option	-55 to +155°C	widest low-temperature flexibility
NBR — option	-40 to +80°C	cost-driven moderate-temperature builds
HNBR — option	-40 to +150°C	abrasion-and-heat combinations
OCP service window	+17 to +65°C coolant	operating envelope defined by UQD Rev 1.0
OCP transport window	-40 to +75°C	storage and shipping envelope per the spec
Qualified coolants	DOWFROST LC 25 · JEFFCOOL ISF-25	wetted-material compatibility baseline
Safety reference	IEC 62368-1 Annex G.15	clause referenced for coolant-contact materials
Leak budget	0.020 – 0.070 ml per disconnect	OCP limit by size, UQD02 through UQD08
Cycle rating	5000 mate cycles minimum	OCP floor validated on batch samples

Seal Quality Control

How a seal lot earns its place in a set.

Seals are small, cheap and catastrophic when wrong — so compound lots are controlled harder than the metal around them.

Incoming & compound control

1Compound identity — every seal lot arrives with compound certification and is checked for hardness and dimension before kitting.EVERY LOT

2Compression set — compound-lot compression-set data is held on file so a 5000-cycle spring stack never fights a flattened seal.PER LOT

3Fluid exposure — samples from new compound lots soak in water-glycol coolant before the lot is released to assembly.NEW LOTS

4No paperwork, no assembly — a seal lot without traceable compound records is quarantined and never reaches the assembly cell.HARD STOP

5Storage & rotation — seals are stored sealed, dated and rotated so shelf age never enters a set unrecorded.FIFO

In-process & outbound verification

1Clean seating — seals are seated in a controlled area; a particle dragged past a valve seat defeats even a passing leak bench downstream.CONTROLLED AREA

2Torque-critical retainers — seal retainers are fastened under calibrated torque so compression is repeatable set to set.EVERY SET

3Vacuum decay — 100% of sets pass vacuum-decay leak testing before any marking or packing.100%

472 h glycol soak — sampled sets soak at the -40 to +120°C class endpoints before packaging release.SAMPLED

5Report in the box — seal compound, leak and soak results ship as part of the batch documentation pack.EVERY BATCH

FAQ

Seal questions, answered with numbers.

Which seal should I choose for a 45°C glycol loop?

EPDM. It is the standard compound for water-glycol service from -40 to +120°C and the basis for OCP UQD material qualification against the DOWFROST LC 25 and JEFFCOOL ISF-25 coolant families.

Can seal compounds differ across one manifold?

Yes, by position. Supply and return runs at different temperatures can carry different compounds — on custom manifolds we map the compound per port and record it in the batch documentation.

What seal data ships with a batch?

Compound identity per lot, leak results from 100% vacuum-decay testing and 72-hour glycol soak records for sampled sets — packed with the report inside the carton.

Tell us the coolant and the temperatures. We will name the compound.

Loop profile in, seal recommendation back within 48 hours — MOQ from 50 pieces, standard sets in 15 days.

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