b'SIGHT GLASSES - SLSG SERIES malfunction of the hinge pin. Where sight flow indicator travel is not sufficiently smooth, remove hinge pin. Fit a new hinge pin and indicator.1 1 . 0 R E S S U R E T E M P E R A T U R E PR A T I N GFlange & Body Rating Refer to Pressure/temperature rating of supplied standard flanging and pressure rating of glass (see as-built drawing, see Appendix A)Working temperature* -20C ~ 200C (-4F ~ 392F)*PTFE bonnet gasket 200C maximumThe glass will down-rate the pressure rating.Australian Pipeline Valve - Installation, Operation and Maintenance Manual 9'