VICI VALCO ANALYTICAL COMPONENTS
Internal nuts – stainless steel
Nuts with product numbers starting with Z are for use with all standard Valco internal fittings and most valves. They may be used with fittings from other manufacturers as well. The L (long) and XL (extra-long) types are for situations where the fitting head may be otherwise inaccessible or where interference between fittings exists, as on many Valco multiposition valves. Standard material is 300 series stainless.
Controlled radius nuts – stainless steel and PEEK
These patented* special purpose nuts facilitate a tight bend as the tube exits the fitting, and can also help prevent kinks in very thin wall tubing. Controlled radius nuts are available in a range of sizes. Note that the short version (ZSN1R) can only be used in certain applications.
External nuts – stainless steel
External nuts are used with external fittings, such as our column end fittings (ECEF series) and external unions (EZU and EZRU series). They may also be used with Valco ferrules on Parker CPI and Swagelok type fittings. Standard material is 300 s.stainless.
Ferrules(Metal ferrules, Polymeric ferrules, Reducing ferrules(Internal/External/Standard)
Valco metal ferrules cut a ring near the end of the tube, preventing tube release at high pressures without significantly deforming and restricting the tube interior. (However, if the hardness of the tubing is equal toor greater than that of the ferrule, deformation of the tube rather than a cut ring is likely.) Make up usually takes only about a 1/4 turn beyond the point where the ferrule first starts to grab the tubing. Polymeric ferrules seal by the increased friction from compression. Valco zero volume ferrules may be used with all Valco fittings and with those of most other manufacturers.The maximum pressure limit is generally determined by the yield strength of the tubing. The maximum pressure for softer materials (such as brass and polymers) is lower, and depends on the tubing used. If in doubt about a particular combination, consult our technical staff. For trace gas analysis, use gold-plated ferrules to achieve sealing with <10 -9 cc/atm/sec leakage.
Fused silica adapters
Fused silica adapters are available in Valcon polyimide for use up to 350°C and in PEEK for lower temperature applications (up to 175°C). Valcon polyimide is unique graphite reinforced composite, specially prepared to maximize mechanical stability at high temperatures. Small blocks are subjected to extremeloads by a process known as hot isostatic pressing, with individual ferrules subsequently machined from these blocks. The result of this two step process is a fused silica adapter with high temperaturestability which far exceeds that of parts produced by conventional moulding.
Injector nut for Agilent 6850, 6890, 7820, 7890, and 5890, Series I and II
This self-compensating nut is a direct replacement for the standard nut on the split/splitless injectors of the Agilent GCs listed above. This retrofit offers enhanced ferrule reusability and temperature stability, resulting in fingertight leak-free connections over the full programmed temperature range of mass spectrometry and gas chromatography. The design of our fused silica fittings ensures stable, leak-free connections at temperatures up to 400°C, and undistorted ferrules that are easily removed and reused. Columns may be changed without the risk of the leaks which can devastate systems such as mass spectrometers or atomic emission detectors. This is accomplished with a spring-loaded self-compensating nut which provides a constant sealing force as the temperature varies. To use this nut, the split/splitless disk must also be upgraded; the new disk will also work with older HP nuts and ferrules.
Unions ( Internal, External, External/internal, Bulkhead & Reducing)
Unions join two pieces of tubing of the same OD. Select the union with the bore that matches the ID of the tubing. If the IDs are different, choose the union with a bore which matches the smaller tube bore. Standard material is 300 series stainless steel.
Tees & Crosses
Tees connect three lines. Standard material is 300 series stainless. Crosses connect four lines. Standard material is 300 series stainless. Also available in Hastelloy C, gold-plated stainless, and titanium.
Manifolds
Manifolds connect 4 - 16 inlet lines to a single outlet, and are often used to connect the outlets from several columns to a single detector. The unique angled entry of our design reduces dispersion to a minimum. Available with 1.00 mm inlet/outlet bore. Standard materials are PEEK or 300 series stainless
Pipe adapters
Male/Female pipe adapters make a minimum volume connection from the male/female pipe fittings on pressure gauges and regulators to Valco zero dead volume internal fittings. Standard material is 300 series stainless. Also available in Hastelloy C and titanium.
HPLC column end fittings
Although our column end fittings look like ordinary reducing unions, they are machined with a conical recess to match a specific column ID so that there are no abrupt or irregular diameter changes which can cause loss of theoretical plates. This optimization results in an assortment of column end fittings for each column OD. To receive full benefit of this design, use column end fittings only with the specific column ID for which they are intended. We can design special fittings for unusual sizes or OEM use. If a temporary frit is used during column packing, the frit OD should match the column OD. Permanent frits should have an OD matched to the column ID, and should be pressed in to give the lowest dead volume. Our frits are available in a variety of pore sizes, and we offer titanium and Hastelloy C frits for systems sensitive to exposed stainless steel.
Precolumns (guard columns)
Precolumns are available in 2 cm and 5 cm lengths, and can be filled with either 5μ packing or 37 - 44μ pellicular packing. Both lengths are used in conjunction with a column end fitting. When packed for high efficiency they can be used as analytical columns, but a more typical use is as a guard column installed between the injector and the analytical column. Standard material is Type 316 stainless.
Filters
There are many flow elements of analytical instruments which require protection from foreign particles, such as orifices that may become plugged or surfaces that may get scratched. However, conventional filtering devices may have too large a volume to be consistent with good system performance– particularly in chromatographic applications. Valco’s unique filter design results in extremely low internal volume and simplifies filter element replacement. Filter bodies are “coned” for uniform flow and maximum filter surface area. The filters are made entirely of metal, so they can be used at any instrumentation temperature. While the standard metal is 316 series stainless, filters can be made from alloys that can be used in virtually any application.
Last Drop mobile phase filter allows more analyses per batch of mobile phase and helps reduce hazardous waste. The flat filter element sits parallel to the bottom of the reservoir, allowing the Last Drop to filter all but the last 2% of the mobile phase from the reservoir without drawing air into the system. Compare this with conventional cylindrical filters that can begin to draw air into the system when nearly 10% of the solvent remains in the reservoir. The Last Drop mobile phase filter consists of a 316 stainless or PTFE filter element pressed into an inert PTFE housing. The top of the housing has a PEEK tripod which slips into 1.5, 2.2, or 3.5 mm ID pump inlet lines. It willalso work with our 1/16" and 1/8" flangeless fittings. Use the metal-free PTFE version for sensitive biochromatography applications in which metal surfaces may corrode or interact with samples.
Last Drop filter/spargers combines filtration and sparging in a single unit. The PTFE housing contains a mobile phase filter with either a stainless steel or a PTFE filter element. The filter/sparger features a PEEK tripod connector for the solvent line, and a nut and ferrule for the sparging line.
Mobile phase or solvent reservoirs
These high density polyethylene reservoirs for in-line solvent use come with polypropylene caps, 1/4-28 flangeless fittings, and 1/8" PTFE tubes for one or two lines plus vent. Plugs are included for conversion to solvent storage when the reservoir is removed from the system. Optional PTFE filters with titanium frits are also available.
Tubing( Metal/Polymeric)
We offer chromatography grade tubing in ODs of 360 μm, 1/32", 1/16", and 1/8". Tubing can be ordered in economical pre-cut standard lengths, or can be custom cut to meet your specific instrumentation requirements. All Valco metal tubing is chromatographic grade seamless drawn tubing of the highest available quality. Stainless tubing is 316 series. Forty years of Valco experience show that the particles left in poorly cut tubing are the number one cause of valve damage. For optimal zero dead volume connections, make sure your tubing meets the best industry standards—OD tolerance should be nominal dimension ±.002".
Valco Injectors and Valves for GC
For over 40 years Valco valves have been the industry standard in gas chromatography. Models are available with 3, 4, 6, 8, 10, 12, or 14 ports, with 1/32", 1/16", 1/8", or 1/4" fittings, and with bore sizes from 0.25 mm (.010") to 4 mm (.156"). In addition, Valco valves offer the widest range of rotor and body materials of any valve available, with alloys and polymer composites capable of meeting virtually any system requirement. All models can be ordered in manual, pneumatic, or electrically actuated versions.
1/16" Stainless steel loops for W/UW Type valves
Each stainless steel loop includes two stainless nuts and two stainless ferrules. Order special fittings separately. Other materials available in many sizes: Electroformed Nickel, Hastelloy C, Nickel 200, PEEK, PTFE, and Titanium Loops > 2 ml are made from 1/8" OD tubing with brazed or welded 1/16" tube ends or reducing unions. Sample loop shape and dimensions may vary from batch to batch due to fluctuations in tubing ID. Loop volume is controlled as closely as possible, but is not calibrated.
Actuators
Air actuators offer reliable performance under the most stringent conditions. Low gas consumption and lightweight, compact construction make the air actuator suitable for aerospace flight hardware applications as well as laboratory or process applications. The standard air actuator is rated for up to 80 psig at temperatures up to 70°C. Generally speaking, valves which will be heated require a standoff assembly, which locates the air actuator out of the heated zone and supports both the valve and actuator. A high temperature model permits both valve and actuator to be mounted within an oven (175°C maximum), but it is not recommended for use below 50°C.
Purge housings
Purge housings for Valco valves eliminate any possible diffusion from the atmosphere into the valve, or safely vent fugitive emissions from the valve. They are typically used in trace level analyses to isolate the valve from ambient air, but can also be used as a safety measure to isolate a valve against leaks into the atmosphere, such as when pyrophoric, toxic, or carcinogenic materials are present in the sample stream.
On/off and prime/purge valves
Valco high pressure on/off or prime/purge valves feature quality engineering, precision machining, and extremely low internal volume (< 2 μl), making them the ideal choice in the most demanding liquid or supercritical fluid chromatography or extraction systems.* The on/off function is self-explanatory; in prime/purge models, mobile phase flows around the needle when the valve is closed, relieving the back pressure from the column. When the valve opens, mobile phasevents to waste to prime the pump.
Combo valves
A new generation needle and shutoff valve combines flow control and positive shut-off without damage tothe needle. Since the flow setting is not changed by turning the valve on and off, the valve is ideal for providing hydrogen and air to an FID. It can also be used to supply makeup or combustion gas in a wide variety of applications. Flow is set using the screwdriver adjustment in the center of the on/off knob. The valve body materials are anodized aluminium or stainless steel, with Viton® O-ring seals. Maximum temperature is 100°C, and maximum inlet pressure is 100 psig.
Gas Flow Controllers
Flow controllers provide a stable flow rate under varying pressure. VICI flow controllers are precision machined from aluminum or stainless bar stock to eliminate the contamination often found in die cast parts. Positive flow shut-off is provided by an integral Viton-sealed adjustment valve. With all our flow controllers, the inlet pressure must exceed the outletpressure by a minimum of 10 psi.
Pulsed discharge detectors
Non-radioactive, multiple mode electron capture / helium photoionization
we offer plug & play models of the PDD/HID for the Agilent GCs and other GC manufactures like former Varian, Shimadzu and Thermo. Most of the components we supply to the instrumentation industry are from our valve and fitting lines. The rest, from our R&D 100 Award-winning pulsed discharge detectors to our application-dedicated trace gas analyzers, are primarily for gas detection and purification. VICI PDDs (pulsed discharge detectors) utilize a stable, low powered, pulsed DC discharge in helium as an ionization source. Eluants from the column,flowing counter to the flow of helium from the discharge zone, are ionized by photons from the helium discharge. The bias electrode(s) focus the resulting electrons toward the collector electrode, where they cause changes in the standing current which are quantified as the detector output. Performance is equal to or better than detectors with conventional radioactive sources.
Helium and nitrogen Gas purifiers
· CE certified
· Gases purified (He, Ne, Ar, Kr, Xe, Rn, N2)
· Maximum pressure (1000 psig)
· Impurities removed (Outlet impurities less than 10ppb H2O, H2, O2, N2, NO, NH3, CO, CO2, and CH4,based on 10ppm total inlet impurities. Other impurities removed include CF4,CCl4, SiH4 and light hydrocarbons.)
Miniature gas purifiers
The Valco Miniature Helium Purifier (HPM) and Miniature Nitrogen Purifier (NPM) are designed to be installed in a gas chromatograph’s flow path immediately upstream of the injector. The HPM/NPM will remove any contaminants introduced by flow controllers, elastomeric tube seals, pressure regulators, crude traps, or other system components that are not completely clean and leak-tight.
Microvolume thermal conductivity detector
Our dual filament TCD is a stand-alone unit consisting of the detector housing and a controller with electrometer and temperature controls. The detector cell includes two separate nickel/iron filaments, capable of independent or referenced (differential) operation. Cell volume and geometry are optimized for capillary chromatography and enhanced sensitivity at lo flow rates. (Recommended total flow rate: 2-10 mL/min.) Thermal stability is maintained to ±0.02°C, resulting in a stable, noise-free signal. A single 0‑1 millivolt attenuated output for a strip chart recorder is provided through the signal cable at the rear of the controller, with 0-1 volt and 0-10 volt unattenuated signals available through the remote signal cable.
Calibration gas standards
The purpose of a calibration gas standard is to establish a reference point for the verification of an analysis. Permeation tube rates can be certified using standards traceable to NIST by the most basic and accurate laboratory procedure – measuring the gravimetric weight loss over a known period of time at a known temperature. Permeation rate data is already established for hundreds of different compounds, and rates for new compounds can be easily certified using NIST-traceable standards.
Advantages
Calibration devices from VICI Metronics offer several advantages over cylinder-supplied gas calibration standards. Multi-component gas mixtures can be easily generated with NIST traceability employing established EPA and ASTM protocols by using the appropriate combination of permeation devices. This technique also allows the removal of a single component from a gas mixture by simply removing the appropriate permeation device. A wide range of concentrations can easily be generated by simply varying the dilution flow rate.
Dynacalibrator® calibration gas generators
Deliver precise concentrations from ppb to high ppm Use Dynacal® permeation devices as the trace gas source, with front panelaccess to the permeation chamber Proprietary constant temperature system controls chamber temperature at a set point with ±0.01°C accuracy choice of plumbing and flow configurations completely portable pump powered by rechargeable battery or a 12 VDC source (inverter with cigarette lighter plug provided) Available temperature control from 5°C above ambient to 100°C, utilises permeation devices - no bulky cylinders Temperature control with an accuracy of ±0.01°C from 5°C above ambient to 110°C Ultra compact PPB to high PPM range.
GC capillary columns
ValcoBond® capillary columns
Individually tested High temperature range Competitive pricing We use proprietary liquid phase processing to produce low bleed characteristics while maintaining retention characteristics identical to the phases you are used to.
ValcoPLOT® capillary columns
Widest polarity range Faster than micropacked Water tolerant Reduce run time by replacing your packed columns with ValcoPLOT HayeSep capillary PLOT columns, with phases available only from VICI. Our proprietary phase processing produces the first capillary PLOT columns with characteristics identical to HayeSep packed columns.
Gas Specific Purifiers and Contaminant Traps
· Original equipment in Agilent® Mass Spec and LC Mass Spec
· Provide point-of-use gas purification of helium, hydrogen, methane, nitrogen, carbon dioxide, or air
· Reduce gas impurities from high PPM to low PPB levels
· Decrease baseline noise and increase GC/MS sensitivity Replace three traps with one purifier
· Replace three traps with one purifier
Analytical Gas and liquid Syringes
VICI Precision Sampling’s patented Pressure-Lok® syringes feature a PTFE plunger tip, stress-formed by a special process to ensure a leak-tight seal. The self-lubricating plunger tip stays smooth for the life of the syringe, with none of the seizing or residue buildup associated with conventional all-metal plungers. The needle is sealed by a PTFE sleeve, or packing, which effectively isolates the sample from the needle cement and prevents any possible dissolution of the adhesive or contamination of the sample. All Pressure-Lok syringes feature ultra smooth bores, easily replaceable parts, low dead volume, crisp clean graduations, and precision calibration.
Magnum Series Gas and liquid Syringes
· Built-in twist-lock valve Seals the sample (up to 30 psi) during transportation to the analysis site
· Up to 500 ml capacity For sampling low concentration levels
· Positive rear plunger stop Prevents plunger from blowing out when contents are pressurised.
The detection of low levels of various environmental contaminants can require extraordinarily large samples. Magnum syringes facilitate the trapping of such samples in remote locations. A built-in valve allows the sample to be sealed within the syringe, maintaining sample integrity during transportation to the analysis site. Magnums have been successfully used to sample atmospheric contaminants such as sulfur dioxide and oxides of nitrogen at distant points of the earth. The positive displacement capability of the durable PTFE plunger seal permits use in a variety of subsequent procedures involving extraction or concentration of trace components. (With a cryogenic enrichment apparatus, for example.) The standard termination is a female threaded fitting (1/4-28), which accepts a variety of Cheminert® connectors or adapters. Specially formed seals permit leak-tight operation to 30 psi (~ 2 atmospheres). Because of the obvious danger in overpressurizing any glass container, the internal pressure of a Magnum gas syringe should never exceed 2 atmospheres.
Autosampler Syringes
All our autosampler syringes conform to specifications supplied by the manufacturer.
Varian We supply the syringes for the Varian GC 511, PTA30, PTA30WS, and Archon instruments.
Tools
As a convenience to our customers, we stock several standard tools that are useful for working with valves, fittings, and other products from VICI. In addition, we offer custom tools which are designed and machined in our factory to facilitate use of specific VICI products.
Pencil magnet
A pencil-type magnet is useful for removing the rotor from Valco valves when the rotor must be replaced or rotated. The process of disassembly and assembly is described in Technical Note 201 of VICI catalogue.
Template This tool is just what you need when you’re working out plumbing and valve switching schematics. It features templates for two position valves with 4, 6, 8, and 10 ports with indications of both positions, as well as various flow symbols. For added convenience, the sides are edged with metric and inch rulers.