A product of the company Lenz Laborglas GmbH & Co. KG and Wolfgang Eger Glasapparatebau & Präzisionsglas
4-point-safety-valve.com
Optimized valve assembly for glass apparatus construction
DURAN® 3.3 TECHNICAL DESCRIPTION & DATA SHEET VERSION FROM FEBRUARY 17, 2025
4 building blocks
for more safety
elastomer bearings
and pressure relief
springs to protect the
components during
operation
Vacuum tightness
due to multiple
redundant seals
against the glass
housing
Replaceable valve
spindle
Material group
diagram based on
DIN 2403
Handling
Multiple end position
damping
1
Tightness
Multiple redundant seals
2
Interchangeable
One valve spindle for all
sizes 4, 6 and 8 mm
3
The 4-point safety valve offers safety in handling, tightness,
interchangeability and application labeling.
Multiple protective functions for glass housing and valve plunger thanks to
damping elements. Highly vacuum-resistant design thanks to defined, high-
precision valve seat from 45º to 60º in the glass housing and matching valve
stem tip of 60º as well as multiple redundant valve stem seals to the glass
housing. One valve plunger covers all available flow sizes 4, 6 and 8 mm.
Optional color coding according to flow groups.
Kennzeichnung
Through color coding
4-POINT SAFETY VALVE:
A product of the company Lenz Laborglas GmbH & Co. KG and Wolfgang Eger Glasapparatebau & Präzisionsglas
Disassembly and assembly of the 4-point safety valve
Dismantling: (First relieve the pressure spring !!!)
!!! With the valve closed, loosen the screw in the valve cap using a Phillips screwdriver
size “PH1” or similar until the lens head protrudes from the cap or the pressure spring
around the valve spindle is relieved.
Unscrew the unscrewing lock from the screw cap in the “Up >” direction, then unscrew
the valve spindle.
Assembly:
Screw the valve pin into GL18 until the screw cap is at the stop. Now screw in the
protruding lens head until the valve seat opens slightly.
Valve closed
Lens head protruding
Pressure spring relieved
Finally, slowly
unscrew the lens head
until the valve seat is
closed. Your valve is
now set for high
tightness and a long
service life.
Screw cap on stop, valve closed
Screw in the protruding lens head until the valve opens
Final setting
A product of the company Lenz Laborglas GmbH & Co. KG and Wolfgang Eger Glasapparatebau & Präzisionsglas
Substance group
Flow-through substance examples
Color ring labeling
Group 0 - Vacuum-proof (Standard labeling)
Underpressure application
White , White
Group 1 - Water
Drinking water, hot water...
Green , Green
Group 2 - Water vapor
Exhaust vapor; superheated steam...
Red, Red
Group 3 - Air
Ventilation, exhaust air....
Gray, Gray
Group 4 - Flammable gases
Natural gas, flue gas...
Yellow, Additional color: Red
Group 5 - Non-flammable gases
CO2, carbon dioxide, nitrogen...
Yellow, Additional color: Black
Group 6 - Acid
Electrolyte, acetic acid...
Orange, Orange
Group 7 - Lye
Alkaline waste water, ammonia...
Violet , Violet
Group 8 -Flammable liquids
Alcohol, oils....
Brown, Additional color: Red
Group 9 - Non-flammable liquids
Emulsion, Glysantin...
Brown, Additional color: Black
Group 10 - Oxygen
Ozone
Blue , Blue
Group 11 - Inert gases
Argon, helium...
Green, Additional color: Brown
COLOR CODING OF THE FLOW RATE GROUPS ACCORDING TO INTENDED USE USING RING MARKINGS ON THE VALVE HANDLE IN
Extended by : Group 0 - Vacuum-proof / Vacuum application = White, White
Description
Glass
DURAN®, Borosilicate glass 3.3
Medium contact surface
PTFE<—>Glass
Valve handle
Polyamide
Field of application
Vacuum, gas, liquid
Temperature range
from -20 to +200 °C, high chemical resistance
Valve spindle
Interchangeable across all sizes 4, 6, 8 mm
Special design
for high vacuum resistance and increased glass stability
Further information
Ideal for precise dosing, the spindle adjusts automatically, available as a shut-
off and globe valve, the valve plunger is also optionally available with an O-
ring seal against the valve seat.
Technical data 4-point safety valve
By
Lenz Laborglas GmbH & Co. KG, 97877 Wertheim, Am Ried 8, Telefon: +49 (0) 93 42-96 09-0
USt.-IDNr.: DE146573788
Wolfgang Eger Glasapparatebau&Präzisionsglas, 97956 Werbach-Wenkheim, Am Kutschenberg 4, Telefon:04473 927698
USt-ID:DE229862265
Imprint: Wolfgang Eger Glasapparatebau&Präzisionsglas, 97956 Werbach-Wenkheim, Am Kutschenberg 4, Telefon:04473 927698 USt-
ID:DE229862265
Data protection:Responsible: Data protection officer Wolfgang Eger Glasapparatebau&Präzisionsglas, 97956 Werbach-Wenkheim, Am
Kutschenberg, 4 Telefon:04473 927698, eger@ineti.de
Only pseudonymized log files are automatically stored for 7 days. This is a standard procedure.
Technical data:
Color code identification:
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/// Made in Germany
A product of the company Lenz Laborglas GmbH & Co. KG and Wolfgang Eger Glasapparatebau & Präzisionsglas
The 4-point safety valve is used for:
ILUDEST®
Lenz® Laborglas
ROFA Germany
Wolfgang Eger
Glasapparatebau&Präzi
sionsglas
Glaskomponenten
Roland Zain
References:
Marc Ullrich
Ullrich Laborbedarf
Online publications:
Language
Url:
German !
https://4-punkt-sicherheitsventil.de
English " , #
https://4-point-safety-valve.com