Pressure Protection Systems (PPS)
Applications
The Cort Pressure Protection System (PPS) is designed to protect equipment downstream of a pressure reducing station in a gas distribution system. It consists of a trunnion mounted ball valve, complete with Scotch Yoke actuator and control system supplied in a self-contained and compact unit. Pressure Protection Systems are installed in the pipeline, downstream of pressure reducing stations. If there is an excessive rise of pressure downstream of the station, due to an equipment or operational malfunction, the Pressure Protection System will react by shutting off the supply of high pressure gas.
Product description
Totally self-contained unit featuring:
Trunnion Mounted Ball Valve
- Trunnion-mounted
- Two piece or three piece construction
- Double block and bleed in open and closed position
- Antistatic device
- Sealant injection system
Scotch Yoke Actuator
- Double acting scotch yoke
- Yoke design optimised to give increased torque output in breakout/reseat position
- Low friction self-lubricating PTFE piston seals as standard
- Nickel plated steel alloy drive shaft and hardened steel alloy yoke assembly
- All bearing surfaces lubricated for life
- Lapped and anodised cylinder bores
- Acetylic resin drive shaft bearings
- Anodised actuator body to prevent external corrosion
- Weather proof design to IP68
Control cabinet
- Diverter valve for balancing up and down stream pressures on the pipeline valve
- Filter to ensure the control components are supplied with clean gas
- Regulator to control the gas supply pressure to the actuator
- Pressure sensor to provide shut down signal on sensing rising down stream pressure
- Directional control valve, with manual push button, closes valve on receipt of shut down signal
- All control components are tubed together using a stainless steel tube and fittings
- All control components are housed in a weatherproof IP65 cabinet
Range of supply
- Valve bore sizes – 2” (50mm) to 12” (300mm)
- Valve pressure ratings – ANSI Class 300 and 600
- Pipeline pressure maximum – CL 300 / CL 600, 450 psig / 1000 psig
- Pipeline pressure minimum – CL 300 / CL 600, 250 psig / 400psig
- System ranges – 15/150psig, 50/450psig and 50/1500psig
- System sensitivity – +/- 2% of the set point
- Speed of operation – Nominal – 5 seconds, Maximum 5 – 10 seconds
- Options – Falling pressures, Falling & Rising pressures, other sizes and pressure ratings are available on request