Cleanroom Assembly & Double-Bag Packaging
The last manufacturing step is as important as machining. Cleaning, cleanroom assembly and packaging decide whether a valve arrives at the tool in the condition its material and surface finish were designed for.
Cleaning
Wetted parts are degreased, cleaned and dried using a controlled process. Residual hydrocarbon or water on a supposedly UHP part will show up later as slow dry-down and an out-of-spec dew point.
Assembly environment
Assembly takes place in a controlled clean area with clean tooling and gloves. Diaphragm and seat installation are the highest-risk steps because they directly touch the flow path.
Double-bag packaging
The valve is sealed in an inner clean bag, capped at every port, then sealed in an outer protective bag. The double-bag lets the inner package be brought into a clean area without exposing the outer surface history.
Labelling and traceability
Each package carries the model, serial number, material heat and leak test reference. That makes a later qualification audit far simpler than reconstructing records from a batch.
On-site discipline
Open the bag only at the installation point, keep caps on until the joint is ready and never return an opened valve to stock as new.
Related reading
Electropolishing & Ra Surface Finish
Why electropolished wetted surfaces and low Ra values matter for specialty gas valves
UHP Valve Helium Leak Rate Standard
How helium mass spectrometer leak testing is specified for UHP valves: inboard versus across-seat
UHP Diaphragm Valves
Ultra high purity diaphragm valves for specialty gas delivery. 316L VIM/VAR bodies
Specialty Gas Safety & Material Compatibility
Safety principles for specialty gas valves: gas compatibility, fail-safe state
How to Select a Specialty Gas Valve
A practical selection guide for specialty gas valves: gas compatibility, pressure, Cv
Diaphragm Valve vs Bellows Valve
Compare UHP diaphragm valves and bellows sealed valves for specialty gas: dead volume, temperature
UHP Valve Helium Leak Rate Standard
How helium mass spectrometer leak testing is specified for UHP valves: inboard versus across-seat
Frequently Asked Questions
Why double-bag a valve?
The outer bag is removed before entering a clean area, so the inner sealed bag keeps the valve isolated from the workshop environment.
Are port caps necessary?
Yes. Caps protect the face-seal faces and keep particulates out of the flow path during transport.