1/4"-28 UNF screw-in valves | 
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- Fit any flat-bottom 1/4"-28 UNF female port
- Simple on-off valve, or 2-way venting valve
These valves fit any 1/4"-28 UNF female flat-bottom port and simply screw in place enabling quick and easy valving of your fluid system.
Two options are available:
Straight-through valve
This valve has a
1/4"-28 UNF male thread at one end and a small, variable bore Omnifit 'cap-type' connection at the other which will accept any hardwall tubing between 0.5 and 4mm OD.
3-way valve
This valve has one 1/4"-28 UNF male thread and two small, variable bore Omnifit 'cap-type' connections which will accept any hardwall tubing between 0.5 and 4mm OD.
The valve has a single key, allowing selection of either of the two Omnifit 'cap-type' ports.
The
valve is ideal for use as a bleed valve, for example in low pressure chromatography, enabling quick and easy venting of air from the system.
The valves are supplied with Viton O-rings, 1/16'' PTFE cones and coloured polypropylene caps integral to the Omnifit 'cap-type' connection system.
O-ring option
One large and two small Viton O-rings are supplied as standard with every valve. These allow instant connection of tubing sizes from 1mm to 4mm OD and
make a compression-type fitting.
PTFE cone option
1/16'' (0.4mm) PTFE cones are supplied as standard with every valve.
A range of PTFE cones to accept other tubing sizes from 0.5mm to 4mm OD tubing are also available separately.
PTFE cones also make a compression-type fitting, but ensure an all-PTFE flow path.
The coloured or Tefzel caps have an internal thread that accepts 1/4''-28 UNF fittings, such as the Omnfiit inverted cone or Gripper
fitting.
The PTFE cone supplied with the valve provides the flat bottom for the 1/4'' -28 UNF fitting to give a leak-free, self-centering connection. | 
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1/4"-28 UNF screw-in valves
Part Nos |
#2507 Adaptor with on-off valve has 1/4"-28 UNF male thread at one end and Omnifit 'cap-type' variable bore connection at the other, accepting 0.5 to 4mm OD tubing. Ideal for use as an on/off valve with Omnifit chromatography columns, fitting directly into the coloured endcap
downstream of the column. 
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#1131 3-way adaptor
with on-off valve has 1/4"-28 UNF male thread at one end and 2x Omnifit 'cap-type' variable bore connections, each accepting 0.5 to 4mm OD tubing. Ideal for use as a bleed valve with Omnifit chromatography columns, fitting directly into the coloured endcap downstream of the column. |
