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 pressure. 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 simple purposes. 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 (spindle).

one way stopcocks
Single Way Stopcock Available with different arms, bending tubes, capilliary, enlarged arm and gas sampling tube.


For Single Way Stopcocks


two way stopcocks
Two Way Stopcock According to DIN 12 553, the keys of the stopcocks are fitted with two parallel bores. Delivered with hollow glass plug and either with plain arms or capillary arms.



For Two Way Stopcocks


three way stopcocks
Three Way Stopcock Available with different arms, bending tubes, capilliary, & enlarged arm



For Three Way Stopcocks


tail stopcocks
Tail Stopcock These three way conical stopcocks according to DIN 12 555 with axial bottom outlet at the key are used for introduction of nitrogen. Normally, they are delivered with hollow glass key, but with choice of two bending arms or one bending arm and one enlarged arm.


For Tail Stopcocks


czako stopcocks
Czako Stopcock Three way conical stopcocks with an 120° angle bore in the hollow glass key according to DIN 12 563.

 


For Czako Stopcocks


high vacuum stopcocks
High Vacuum Stopcocks These stopcocks are a special design of the pump stopcocks described before.High vacuum stopcocks, safety pattern are used in vacuum apparatus and serve as locking device.Due to the closed lower part (chamber), a higher tightness is reached compared with pump stopcocks.


For High Vacuum Stopcocks


spindle valve
Straight Valves O-rings, fitted in the valve stamp and with adjustable pressing power, guarantee an excellent sealing between spindle and body.This and the metal cone in the spindle ensure a perfect guiding of the valve insert.


For Straight Valves


right angle valve
Right Angle Glass Valves O-rings, fitted in the valve stamp and with adjustable pressing power, guarantee an excellent sealing between spindle and body.This and the metal cone in the spindle ensure a perfect guiding of the valve insert.



For Right Angle Valves


three way valve
Three Way & High Pressure Glass Valves This valve is ideal for higher operation pressures. The glass part has been designed for pressures up to 10 bar



For Three Way & High Pressure Valves


bottom drain valve
Bottom Drain Valves These valves have an additional adjustable loaded spring in the upper part besides the work-holding device. The plunger is also pressed in its seat by the loaded spring, when the plunger is contracting during the cooling process



For Bottom Drain Valves


spindle valve
Spindle Valves All-round valves are suitable for universal use in laboratory devices, when only low requirements for vacuum tightness are needed


For Spindle Valves


glass needle valve
Glass Needle Valves The high precision guarantees the interchangeability of the glass body and the upper part of the valve. An additional sealing between these two components allows the use of that valve for laboratory devices operating under vacuum.


For Glass Needle Valves


three way and right angle valve
Three Way and Right Angle Valves Three way and right angle glass valves

 

For Three Way and Right Angle Valves