An engineering-led technology company in Chongqing, China, focused on one discipline — keeping sealed enclosures pressure-equalised without letting water in — and expanding the product family around it.
We are mechanical engineers who spent our working lives on the other side of the drawing: sizing vents for battery packs and outdoor cabinets, then investigating why a valve that passed validation failed eighteen months into service in the field. That investigation is where we started — and it keeps opening into new product lines.
That experience produced an obvious conclusion. The failure was rarely the membrane material — it was the process around it. A bond that was reworked by hand, an airflow figure quoted from a catalogue rather than measured on the lot, a valve with no way to tell whether it was still doing its job. So we built a company around controlling those specific steps — a written specification for every part we ship, and inspection against it before the goods leave, rather than buying what is already on a shelf and relabelling it as our own.
We stay deliberately focused on one thing: every opening cut through the wall of a sealed enclosure. Cable entries, breathing ports, pressure-relief points. We do not spread into gaskets, general rubber products, or anything that is not an opening in an enclosure wall — which is why a cable gland belongs here as much as a vent plug does. Inside that boundary the family keeps growing: from standard vent plugs today, to failure-indicator plugs and anti-icing relief valves in validation, and the next additions already on the roadmap. That focus is why we can adjust a membrane stack or a spring rate for one customer's duty cycle without it becoming an exception to a product plan.
“Every step in our process has to justify itself on the bench — nothing survives here just because it has always been done that way.”
What that means for a buyer: you deal with the engineer who designed your part, you get the measured test record for the parts you actually receive, and you get a straight answer — including “we cannot verify that yet” — when a requirement sits outside what we can currently prove.
They cost us orders occasionally. They are also the reason buyers stay once they have tested our parts.
If a figure has not been measured, it does not go on a datasheet. Where a customer needs a specification we cannot yet verify, we say so and agree a test plan instead of printing an optimistic number.
Testing before marketingMembrane lamination, insert bonding, assembly and lot testing are specified on our own process sheet and verified against it before goods leave. We own the specification, the material callout and the release criteria — we do not sell someone else's valve with a new part number.
Process controlIf a requirement is outside our capability, if a tooling cost will not amortise at the volume you have, or if a lead time is unrealistic — you hear it before purchase order, not after.
No engineering theatrePressure imbalance inside a sealed enclosure, and the fact that nobody finds out about it quickly enough.
Our core development programme. A standard M20×1.5 vent plug body — PC/PA66, V-0, ePTFE membrane — with a colour-change indicator integrated behind a toughened window. A maintenance engineer sees membrane saturation or blockage from outside the cabinet, without opening a single fastener.
A spring-loaded relief valve for NEV battery-pack thermal management, with an anti-icing collar at the seat. The problem it solves is specific: in cold-climate duty cycles, condensate can freeze at a conventional valve seat and lock the poppet shut — exactly when the pack needs to shed pressure.
Every vent runs the same three stations before it is packed: the membrane is staked into the housing, the inserts are seated, and airflow and water entry are verified. What we hold across those stations is the written specification for each step, the incoming inspection when parts arrive, and the release decision before anything ships.
Tooling is quoted as its own itemised line, so you can see exactly what you are paying for — nothing is bought ahead of a contract. When a programme justifies a second mould, a dedicated inspection cell or a bench of its own, we will price it as a separate project rather than burying the cost in the unit price.
Discuss tooling and capacityePTFE is laminated to its support layer, treated for oil resistance and die-cut before bonding. Airflow is checked on the laminate itself, not on the finished valve.
Polymer housings in PA66, PC and PBT, including flame-retardant grades, moulded to our drawings and to yours. Moulding capacity and tooling cost are quoted with the part.
Brass, stainless and aluminium bodies turned and milled to drawing. Threads are gauged on incoming inspection rather than assumed, and plated finishes are specified in writing before any order is placed.
Seals fitted, airflow and water-entry pressure checked by lot, and every shipment released with that lot's record attached. Ask for the record on any part number and we will send it.
Process steps run to a written specification, and each shipment is released against it.
No padded history and no borrowed achievements — this is the actual sequence of events so far, dated, so you can judge the progress for yourself.
Company registration details, business licence and export documentation are supplied to buyers during qualification.
Honvale established in Chongqing as a technology company focused on venting and enclosure protection components.
Vent plug platform taken from concept to a released drawing set: M5 to M20×1.5, with membrane lamination and insert bonding specified and verified before release.
Adhesive-backed ePTFE patches from Ø6 mm to Ø28 mm, die-cut to shape for sensor and panel applications.
IV-M20 indicator vent plug. Sensitivity, ageing and cycle life are still open items; sample parts are available for design-in.
RV-M20-AI spring-loaded relief with heated seat collar, aimed at liquid-cooled NEV battery-pack venting.
Third-party IP-rating and salt-spray reports for main part numbers, automotive material declarations, and expanded test capacity.
No account manager relaying questions to an engineer. No minimum-order posturing. No datasheet figure that turns out to apply to a different configuration.
Send the enclosure details or your drawing and we will reply with a calculation, a recommended part and an honest view of what we can verify.
