DSTI builds compact, sanitary rotary unions for bottle washing machines and other container cleaning systems.
Each union carries hot and cold water and compressed air into the rotating carousel, with high-temperature seals for steam. Materials are FDA-compliant, dynamic seals are qualified to 3-A Sanitary Standard 20, and DSTI manufactures under ISO 9001:2015.
One rotary union feeds all the wash and rinse stations on the carousel. If a seal weeps steam or the union seizes after a caustic cycle, the carousel stops.
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A rotary bottle washing union continuously transfers steam, water, and air from the stationary frame to the carousel without leaking. It holds that seal at up to 200 PSI and 500 RPM while the media swings from hot caustic to cold rinse, cycle after cycle for the length of a production run.
DSTI sizes each union to the washer's duty cycle and mounting envelope. Design, CNC machining, welding, assembly, testing, and qualification all happen under one roof.
Steam and cold rinse water run through adjacent passages simultaneously, and startup, shutdown, and CIP cycles swing the whole union between hot and cold. The housing, shaft, and seals expand and contract at different rates. Clearances that aren't sized for that swing leak when hot or bind when cold.
Caustic wash baths, acid CIP cycles, and sanitizers such as peracetic acid (PAA) attack unprotected metal, bearing grease, and incompatible elastomers. The damage builds over thousands of cycles, so a union that passes a bench test can still fail in production.
Space is tight. A washer carousel packs many stations into a small radius, and the union competes for room with manifolds, drive components, and guarding.
A bottle cleaning system runs continuously, so the union must hold rated speed and pressure across long production runs.
DSTI's sanitary unions use high-temperature UHMWPE dynamic seals qualified to 3-A Sanitary Standard 20. The standard SCS Series is rated from 0°F to 220°F (-18°C to 105°C). Steam rotary unions typically run at 350°F to 400°F, so steam service needs DSTI's high-temperature seal options.
DSTI machines the housing and shaft from passivated 316 stainless steel and coats the shaft with TDC. Sealed ball bearings sit behind a washdown seal, which keeps lubricant in and wash chemistry out. The sealed bearing design resists corrosive acids such as PAA.
Installed vertically, the union drains its seal areas per the 3-A design standard. Drain and inspection ports let maintenance crews check seal condition between wash cycles. The ports require COP or manual cleaning.
Small-footprint designs fit the tight envelopes of multi-station washer carousels. For OEM builds, DSTI matches flange or shaft mounting to the washer's existing geometry.
Plant engineers replacing a failing union on an existing washer have two paths. For a failing union on an existing washer, DSTI can cross-reference another manufacturer's rotary union to an equivalent design or supply seal and bearing kits for an on-location rebuild.
Some washers carry sensors or motorized components on the rotating side. For those machines, DSTI builds a custom assembly that pairs the rotary union with an electrical slip ring, so fluid, power, and signal cross the rotating interface in one assembly.
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DSTI engineers and simulates the design, then CNC machines, welds, tests, and qualifies each custom union in-house before it ships.
Contact UsDSTI rotary unions reliably seal and transfer fluid such as water, air, hydraulic oil, coolant, steam, and other media types from stationary sources to rotating parts.
Our rotary union products are used across a wide range of industries including factory automation, heavy equipment, machine tool, packaging, medical, oil and gas, defense, and aerospace.
We offer standard rotary union product lines grouped by function and feature exclusive sealing technology selected for compatibility to each application's operating pressure, temperature, speed, media, and required service life.
If our standard products aren't a fit for your project, we can provide a custom solution to meet your application requirements. Explore our Food & Beverage solutions, including bottle capping and pharmaceutical blending and mixing, or contact our engineering team.
A 316 stainless steel union with sealed bearings and steam-rated seals. Steam rotary unions are typically rated for 350°F to 400°F. DSTI's standard SCS Series stops at 220°F, so washer steam needs one of DSTI's high-temperature seal options.
It can when the housing, shaft, seals, and bearings are compatible with the cleaning chemistry. DSTI's sanitary unions use passivated 316 stainless steel and sealed bearings compatible with PAA and other acids. The drain and inspection ports still need COP or manual cleaning.
DSTI's standard SCS Series runs from 2.69" in diameter by 3.95" long with a ¾" connection to 8.94" by 7.43" with a 4" connection. DSTI can customize the rotary union to match mounting to the carousel.
A washer union prioritizes heat and chemical resistance over repeated wash cycles. A filler union prioritizes product hygiene and passage isolation, which DSTI covers on its Rotary Filling Systems page.
Yes.