Upstream Pressure Relief Valve - E3116-10 / E4116-10

Applications

• Downstream of pumps to protect the system from uncontrolled pressure increases when switching on or off.
• As protection of industrial and civil plants from uncontrolled pressure increases.
• Downstream of pressure reduction or modulation devices to avoid unwanted pressure fluctuations.

Accessories

• The position indicator with 4-20 mA output.
• The open-close indicator.
• Manometers.
• Self-cleaning high capacity filter.

Notes to the designer

• Inlet and outlet pressure, flow rate and application are required for cavitation sizing and analysis.
• Recommended flow rates and working conditions are given in the E3000 - E4000 valve catalogue.
• When the valve discharges to atmosphere, the anti-cavitation system is recommended.

Optional configurations

• Upstream pressure relief valve with anti-return system.
• Pressure relief valve with solenoid control valve.
• To improve the reaction time of the valve it can be supplied without the control unit

Operating conditions

• Fluid: treated water.
• Minimum pressure: 0,7 bar.
• Maximum pressure: 25 bar. Higher on request.
• Maximum temperature: 70 °C.

Pilot relief adjustment field

• Blue spring: 0.7 to 7 bar.
• Red spring: 1.5 to 15 bar.
• Higher values up to 25 bar on request

The valve is controlled by a high capacity two-way pilot (5) with adjustable calibration which, through the regulation unit (4), receives the upstream pressure value.

If the latter exceeds the calibration value, the pilot opens, discharging pressure from the control chamber (10) with consequent rise of the shutter (11) and flow through the seat (12) to protect the system.

When the upstream pressure drops below the set threshold, the pilot modulates the flow in the circuit, therefore the pressure in the valve chamber increases, bringing the shutter towards the closed position, which stops the flow through the main valve.

The pressure entering and exiting the main chamber (10) is controlled by the exclusive regulation unit (4), equipped with a filter and three adjustable needle valves, necessary to ensure stability and make the opening and closing speeds of the valve independent of each other.

The following figure shows the recommended installation scheme of the E3116-10 / E4116-10 valve, used as a relief valve on a branch of the main line to protect a group of pumps.

The gate valve is required for maintenance operations; where possible, a filter is also recommended, to prevent impurities from reaching the control valve. The pilot setting value must be set at least 0.5-1 bar above the maximum dynamic pressure.