Technical Specification
Medical Lockable Line Valve NIST Medical Lockable Line Valve
Product Description
The medical lockable line valve is intended to be used as a means of isolation on medical gas
pipelines at positions specified in the design of the medical gas pipeline system in order for
maintenance or major works to be undertaken. The medical lockable line valve has three
variations the standard valve assembly, the NIST medical lockable line valve and the NIST
medical lockable line valve with lockable NIST nuts.
The medical lockable line valve is intended to be used in conjunction with CPX NIST tee
connectors to enable the line valve to conform to HTM02-01. Nickel plated nuts complete
with identifying holes supplied with the CPX medical lockable line valve allow “Thru” or
blank plate insertion, therefore converting to a HTM02-01 gas specific NIST valve.
The NIST medical lockable line valve includes the gas specific NIST connectors within the
assembly which conform to HTM02-01 without the necessity of CPX NIST tee connectors. In
addition Precision UK added an extra feature of a locking NIST nut to prevent tampering and
consequently the inadvertent discharges of gas. This feature allows the NIST medical
lockable line valve with lockable NIST nut to be incorporated into the hospital permit to
work system. The NIST nut is lockable in 2 positions for ease of access
The medical lockable line valve should be installed at branches from risers, branches from
main runs, where pipelines pass in or out of buildings, and at the connection of the pipeline
to any source of supply.
_____________________________________________________ __________________________
PRECISION UK Ltd,
CPX Technology Building,
Stockport, Cheshire, UK, SK7 5BW
Tel: +44 (0) 161 487 2822
Fax: +44 (0) 161 487 2816
Email: info@precisionuk.co.uk
The lockable line valves are built in accordance with the HTM02-01, HTM 2022, C11 and
ISO7396 standard’s and are suitable for Oxygen, Nitrous Oxide, Oxy-Nitrous Oxide, Medical
Air, Vacuum, CO2, N2, Argon and Helium or a mixture of these gases.
Materials
The medical lockable line valve comprises of a 2-piece full bore male threaded nickel
plated brass ball valve c/w chrome plated brass ball, blow out proof stem, Viton® Stem O-
ring, Teflon® ball seals, 2x Locknuts with visual indicator for blanking facility and flat face
copper stub pipe assemblies.
The Brass/Copper stub pipe assemblies are manufactured from medical gas copper tube
compliant to BS EN 13348 and are factory soldered to brass flat face seal housings by
phosphorous and silver brazed material using minimum 55% silver content, these assembles
are chemically cleaned to remove any flux and manufacturing oils, sand blasting stub pipes
is not acceptable. Each stub pipe is cleaned and degreased for oxygen service and free from
all particulate matter and toxic residues in accordance with HTM 02-01 and has a maximum
carbon level of 0.2mg/dm².
The copper pipe stubs are of sufficient length to enable brazing directly to the medical
gas pipeline system utilising flux less brazing to WKO (82)1. Flat face housing incorporate
Viton ® O-ring seals ensuring 100% gas tight connections.
Medical Lockable Line Valve size range:
Product Code Type (mm) Overall Length Max Torque
(mm) (N/m)
15LVN 15 362 30
22LVN 22 475 40
28LVN 28 475 44
35LVN 35 563 56
42LVN 42 570 60
54LVN 54 594 98
76LVN 76 785 74
108LVN 108 985 116
For gas specific NIST medical lockable line valves the gas is required to be specified i.e.
22LVN-O2.
_____________________________________________________ __________________________
PRECISION UK Ltd,
CPX Technology Building,
Stockport, Cheshire, UK, SK7 5BW
Tel: +44 (0) 161 487 2822
Fax: +44 (0) 161 487 2816
Email: info@precisionuk.co.uk
Definition of Intended Use
The medical lockable line valve is intended to be used as a means of isolation on medical gas
pipelines at positions specified in the design of the medical gas pipeline system in order for
maintenance or major works to be undertaken.
The medical lockable line valve offer leak free connections as soon as they are installed to
corresponding medical gas pipelines and are safe and easy to use.
The medical lockable line valve is designed to be mounted directly into a medical gas
pipeline system via copper tail pipes supplied and located within wall or ceiling voids or
anywhere that general access is restricted.
The copper pipe stubs are intended to be of sufficient length to enable brazing directly to
the medical gas pipeline system utilising flux less brazing to WKO (82) 1.
The chrome plated valve handle is lockable in the open or closed position by way of a sliding
device, the sleeve of the handle shall be blue in colour and include indication for directional
arrows for open and close, the manufacturer identification mark shall be visible on the
handle as per MDD/93/42/EEC Medical Device Directive, a brass padlock is provided to
prevent unauthorised or inadvertent operation of the valve.
The lockable handle shall use the same size brass padlocks for the full range of ball valves
from 15mm to 108mm.
The medical lockable line valve is provided with a blanking facility as a secondary means of
isolation with the intention to provide a physical barrier to the gas supply in order to
eliminate any risk of contamination during the initial installation or the medical gas pipeline
system or any upgrade/maintenance work. Blank and thru’ plates shall be manufactured
from Brass, plastic is not acceptable. Visual indication of the blanking facility shall be visible
through minimum 7mm orifice.
The pressure rating shall comply with HTM 02-01 guidelines, carcass testing to 18bar for
pipelines with 4, 7 or 10 bar working pressures. CPX valves are rated to 25PN 2500Kpa
working pressure as engraved on the valve body. All valves shall have a minimum safety
factor of more than 3 times working pressure.
_____________________________________________________ __________________________
PRECISION UK Ltd,
CPX Technology Building,
Stockport, Cheshire, UK, SK7 5BW
Tel: +44 (0) 161 487 2822
Fax: +44 (0) 161 487 2816
Email: info@precisionuk.co.uk
Quality
Medical lockable line valves are manufactured in the UK under BS EN 13485 Medical
Devices: Quality Management Systems. All Lockable Line Valve Assemblies are
manufactured under strict quality control procedures to ISO 9001:2008.
CE Marking
Medical lockable line valves are CE marked as a Class IIa Medical Device 93/42/EEC with
notified body British Standards Institute and stamped CE 0086.
Product Cleanliness
Medical lockable line valve is cleaned and degreased for oxygen service and free from all
particulate matter and toxic residues in accordance with BS EN 13348:2001 and has a
maximum carbon level of 0.2mg/dm².
Each valve assembly is individually end capped and sealed in polythene bags to maintain
cleanliness.
Installation Guidelines
The CPX medical lockable line valve may be installed in horizontal or vertical positions.
Either way it is advisable to maintain the following sequence from left to right or top to
bottom.
1. 02
2. N2O
3. 50% O2/50% N2O
4. Med AIR 4
5. Surgical AIR
6. Vacuum
The lockable line valve should be installed at a height that is easily accessible by hand.
The CPX medical lockable line valve should be supported on both sides using the correct
type of fixing as specified in HTM02-01. Supports should be a suitable metallic, non-ferrous
material for example Brass Munsen Ring suitably treated to prevent corrosion and
electrolytic action.
_____________________________________________________ __________________________
PRECISION UK Ltd,
CPX Technology Building,
Stockport, Cheshire, UK, SK7 5BW
Tel: +44 (0) 161 487 2822
Fax: +44 (0) 161 487 2816
Email: info@precisionuk.co.uk
