Vacuum Proof Stopcocks

PISCO Stopcocks (vacuum tested leak proof) are made ruggedly constructed with hollow piston and a tapered flange, which ensures maximum strength at the seal of arms, and are individually finely lapped to the corresponding barrel. Therefore these are not interchangeable but guarantee in vacuum work. A wide range of models is available for individual field of application. The essence of PISCO stopcocks are the minimum possible interspace between the barrel and piston and perfect lapping to enable it to withstand against use in reasonable vacuum. Available in the following models up to 10 mm. bore.

* Straight bore
* 2-way oblique bore
* 3-way a Ta bore
* 3-way oblique bore
* 3-way a Va bore
* 3-way twin (tail) bore

PISCO High Vacuum Stopcocks are made as above but some special techniques are taken in lapping to enable it to withstand against use in a vacuum up to 10-6 mm. of Hg. Each piece of PISCO High Vacuum Stopcock is tested in High Vacuum Unit before it comes to stock. Available in the following models up to 10mm. bore.

* Straight bore
* 2-way oblique bore
* 3-way a Ta bore
* 3-way oblique bore
* 2-way oblique with bulb
* 2-way oblique with cup & bulb
* 3-way oblique with cup and bulb
* 3-way a va
* L-type 2 limbs
* L-type 3 limbs

To get the maximum flow control "PISCO" Stopcocks PTFT piston: To avoid grease contamination PISCO offers Stopcocks with PTFE piston in optically ground finish glass barrel. Lapped pr