Glass Stopcocks & Valves
Made of Borosilicate glass 3.3, distinguish by the high precession
of manufacture and the top surface quality. Barrel and hollow glass key of
the stopcock are interchangeable. The keeping of the sharp tolerance limits regarding
to the angles, mantle line and diameter of the cone leads to a large touching
area from barrel and cone. The result is a high vacuum tightness with minimal surface
Some types of stopcocks are delivered with PTFE or full glass key. Full glass keys
are recommended for use at high temperatures.
A retaining device at the key prevents inadvertent removal and gives additional
safety for operations under slight overpressure. In this point, the stopcocks fully
meet the requirements of DIN 12 540, part 1.
Besides stopcocks, valves are the most employed locking devices in laboratory
technique. Because of their various use, they have to fulfil many jobs. These jobs
reach from simple locking of a liquid at normal pressure to use at high vacuum.
This variety of applications has not only led to a wide range of designs, but also to
spindle valves with higher or lower quality standard with the same cost/performance
ratio. So the user can choose lower price locking devices for
All designs and types have an utmost universal corrosion resistance, because the
media can only get in touch with Borosilicate glass 3.3 (valve body) and PTFE
For Single Way Stopcocks
For Three Way and Right Angle Valves