Type A - with contrast screen
Type B - without contrast screen
GN743.7 Oil Level Sight Glass, Brass Float Glass, Conical Thread
The conical thread of the oil level sight glasses GN743.7 makes a metallic seal possible. When tightening the conical male thread R it blocks itself with the appropriate cylindrical female thread Rp.
With the datum plane a the R male thread has the same thread diameter as the Rp female thread, so that it can be screwed in by hand. Stronger tightening using a tool increases the length of engagement and seals the screw connection.
Additionally a sealant (hemp or teflon band) is usually used. The R thread is roughened, so that the sealant does not shift when screwing in.
Oil level sight glasses GN743.7 can be used on pressurised tanks. Pressure and vacuum pressure test data is available.
Body - Brass, CuZn40Pb2
Contrast screen - Technoploymer (Polysulfon), temperature resistant up to 100 °C
Sight glass - float-glass
O-rings - rubber, NBR (Perbunan)
An EPDM seal is also available on request.