Unified Alloys supplies instrumentation valves and fittings for process control, analyzer, sample, and impulse line applications across Canada. The range covers compression tube fittings in both double-ferrule and single-ferrule designs, needle and metering valves, check and relief valves, block-and-bleed manifolds, filters, and sample cylinders — sized for instrument service from 1/16″ through 1″ tube OD. Our manufacturer partnerships are split by region: Parker Hannifin Instrument Products Division is supplied from our Alberta distribution centres, and Ham-Let Advanced Control Technology is supplied from our British Columbia, Ontario, and Quebec branches. Both lines carry the certifications, traceability, and stocking depth that instrument procurement requires. For the bare and pre-insulated tubing that mates with these fittings, see Instrumentation Tubing.
Product Categories We Carry
Compression tube fittings. Both double-ferrule and single-ferrule designs. Double-ferrule fittings (Parker A-Lok, Ham-Let Let-Lok) use a front ferrule for grip and a back ferrule for sealing — the standard for most instrument and process control hookups. Single-ferrule designs (Parker CPI, Ham-Let One-Lok) use a one-piece ferrule and are specified where mechanical simplicity or specific service preferences require. Tube OD sizes from 1/16″ through 1″ imperial, 2 mm through 25 mm metric. End configurations include tube-to-male pipe, tube-to-female pipe, tube-to-tube, port connectors, bulkhead unions, 37° flare to compression, and welded systems.
Needle and metering valves. Quarter-turn and multi-turn needle valves for instrument isolation, sample line shutoff, and pressure throttling. Metering valves for precise flow control on small-bore lines.
Block-and-bleed manifolds. Single-body assemblies combining isolation, bleed, and venting functions in one unit. Used to replace conventional multi-valve installations on pressure measurement systems, reducing leak paths, weight, and installation footprint. Two-valve and three-valve configurations available; ProBloc-series modular variants combine ball and needle valves into a single manifold body.
Check and relief valves. Non-return and pressure-relief valves sized for instrument service. Typical applications include sample line protection, analyzer line back-flow prevention, and small-bore pressure-relief duty.
Filters and sample cylinders. In-line filters for instrument and sample line particulate removal, plus sample cylinders for laboratory and process sample collection.
Parker Hannifin — Instrument Products Division (IPD)
Parker Hannifin IPD is supplied from our Alberta distribution centres in Calgary and Edmonton. The line covers Parker’s full instrumentation product range — A-Lok and CPI tube fittings, ProBloc double block-and-bleed manifolds, needle valves, metering valves, check and relief valves, filters, manifolds, and sample cylinders.
The A-Lok double ferrule tube fitting is Parker’s flagship compression line — heat-code traceable 316 stainless as standard, with 6Mo, Alloy 825, Alloy 625, Alloy C-276, brass, and carbon steel available. Front and back ferrules use Parker’s Suparcase surface treatment for hardening; silver-plated nuts prevent galling during makeup. A-Lok carries a wide configuration range including tube-to-male/female pipe, tube unions, port connectors, 37° flare conversions, O-ring seal connections, and weld-system terminations. Common service includes steam supply, offshore control panels, and sensing lines.
The ProBloc modular double block-and-bleed valve series replaces conventional multi-valve installations on pressure measurement systems. By combining customer-specified ball and needle valves into a single forged manifold, ProBloc reduces leak paths, system mass, and installation footprint — particularly important for offshore facilities where weight and space drive cost. Configurations include double-block, block-and-bleed, and block-bleed-block. Flange sizes 1/2″ through 3″, ANSI Class 150 through 2500. Ball valve bore sizes 10, 15, 20, and 25 mm. Standard outlet is female NPT with male NPT, CPI single ferrule, and A-Lok double ferrule connections available. Ultra-Low Emission variants meet ISO 15848 Class A or B for fugitive emissions.
See the Parker Hannifin page for product breakdowns and configuration references.
Ham-Let — Advanced Control Technology
Ham-Let is supplied from our British Columbia (Langley), Ontario (Sarnia), and Quebec (Dorval) distribution centres. The line covers compression fittings, pipe fittings, valves, and high-purity components for process control, measurement, and ultra-clean service.
Let-Lok is Ham-Let’s double ferrule compression fitting line — the direct comparator to Parker A-Lok in design and application. One-Lok is the single ferrule alternative. Both are available in 316 stainless as standard, with higher alloys on request, and cover the standard instrument OD range. Beyond fittings, the Ham-Let valve range includes ball valves, needle valves, check valves, and relief valves sized for instrumentation service.
Ham-Let’s high-purity product range serves semiconductor, pharmaceutical, and other ultra-clean process industries where surface finish, particle counts, and material certification matter beyond standard instrument grade. These are project-specified rather than stocked.
See the Ham-Let page for the full catalogue, datasheet library, and high-purity product details.
Specifying and Quoting
Instrument fitting specification depends on tube OD, ferrule design (double or single), end connection type, body material, and service certifications (NACE for sour service, ISO 15848 for low emissions, ultra-clean for high-purity). Confirm all five at the time of quote so the order matches what installs cleanly in the field. For block-and-bleed manifolds, valve selection drives pressure rating and operating temperature — specify the underlying ball and needle valve requirements rather than just the manifold style. Our technical sales team can help match the brand, ferrule type, and configuration to your application, confirm stock and lead time, and quote against your bill of materials.