PG71 Cast Iron Non-Return Sight Glass

The PG71 Cast Iron Sight Glass is designed to provide direct visual observation of flow conditions within compatible industrial pipeline systems. By allowing operators to see the movement of the process medium, the unit can assist with routine system monitoring, operational checks and the identification of irregular flow conditions. Its non-return configuration also helps prevent reverse flow, combining visual inspection and directional-flow control within one compact pipeline component.

Manufactured with a durable cast iron body, the PG71 is suitable for compatible industrial duties operating within its specified pressure and temperature limits. It is available in DN15, DN20 and DN25 sizes, with different flow capacities to match varying pipeline requirements. Screwed NPT, BSPT and BSP connection options enable the sight glass to be incorporated into systems using several common threaded standards.

• Product model: PG71
• Product type: Non-return sight glass
• Primary function: Provides visual observation of flow through a compatible pipeline
• Additional function: Non-return design helps prevent reverse flow
• Body construction: Cast iron
• Maximum operating pressure (PMO): 16 bar
• Maximum allowable temperature (TMA): 200°C
• Capacity for DN15: Up to 3,935 kg/hr at maximum operating pressure
• Capacity for DN20: Up to 5,165 kg/hr at maximum operating pressure
• Capacity for DN25: Up to 6,090 kg/hr at maximum operating pressure
• Available sizes: DN15, DN20 and DN25
• Connection options: Screwed NPT, BSPT and BSP
• Monitoring advantage: Enables operators to check flow movement without opening the pipeline
• Suitable applications: Compatible condensate lines, liquid pipelines and other industrial systems requiring visual flow monitoring
• Selection considerations: Process medium, operating pressure, temperature, required capacity, thread standard and installation direction

Val Technology & Engineering Sdn. Bhd. supplies sight glasses, valves, steam traps and other pipeline components for industrial and commercial facilities. Contact our team in Butterworth, Pulau Pinang today to discuss the PG71 Non-Return Sight Glass and determine the correct size, capacity and connection standard for your pipeline system.