Inclined HYDROVEX® Valve (IHV) vs. Actuated Gate Valve

Carbon Footprint
Technology Comparison

Analysis

The HYDROVEX® vortex valve design is based on the fluid mechanics principle of the forced vortex. The operation of the regulator depends on the upstream head.
Up to a certain static water head, the unit orifice will regulate the flow. When the flow exceeds the capacity of the IHV, the water level rises in the collection system.
This static water head will create a throttling effect in the vortex valve, thus limiting the downstream flow. A central air core is created in the orifice, blocking it off partially , thus diminishing the discharged flowrate.
An actuated valve will be able to achieve the same downstream flowrate, but by applying mechanical actuation to the valve.

Technology Design Data

This specific Inclined HYDROVEX® Vortex valve has been designed to control the flowrate to a maximum value of 20 L/s (or 72 m3/d) at a maximum static water head of 4.8m. Because it only reacts to the static water head upstream, there is no requirement for motors, sensors or electricity. There are no moving parts and once installed in its concrete chamber, the stainless steel built regulator can function normally for 50 years.

An actuated gate valve would require the presence of 460V electricity to be able to move the gate and control the flowrate at 20 L/s for a given head of 4.8m. Also, an upstream water level sensor with telemetry would be required to send the signal of upstream sewage and enable the opening and closing of the gate. The maximum life time of such an installation would be of 20 years.

Evaluation Boundaries

For the Inclined HYDROVEX® Valve, the construction of the regulator and an emergency gate valve were included in the carbon footprint calculation. This regulator was designed with 304 stainless steel and also contained some PVC for gaskets and seals. There is no electricity to be considered for the IHV vortex valve.

As for the actuated gate valve, the calculation includes the gate itself, made of 304 stainless steel, and an emergency manual gate valve, as well as an upstream water sensor and a small control panel. The power requirements for the gate valve, over 20 years, were integrated into the calculations.

Both installations are designed for use in Montréal (Québec), Canada.

Carbon Footprint per Cubic Meter of Water Treated*

 

Carbon Footprint over Life Expectancy of the System*

 

Conclusions

This case study has demonstrated that the Inclined HYDROVEX® Valve (IHV) has a much smaller carbon footprint that an actuated gate valve. In fact, the carbon footprint of the Inclined HYDROVEX® Valve is 70 times smaller over 100 years than an actuated gate valve. Depending on the jurisdiction, the carbon footprint associated with the operation of the actuated gate valve (electricity) can be an even more critical factor in favor of the IHV vortex valve.

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