The Future of Hydraulic Control in Water-Systems. By: Assaf Heimann May 9, Water Loss Conference, Cape Town, 2018

Transcription

1 The Future of Hydraulic Control in Water-Systems By: Assaf Heimann May 9, Water Loss Conference, Cape Town, 2018

2 A control valve in a water system is used to o automatically & automomuosly control hydraulic parameters, by ovarying the size of the flow passage This enables: Control Valves oas directed by a signal from a pilot-system. Direct control of Pressure, Flow and Level Stabilizing the system by prevention and attenuation of water-hammer

3 Control Valves Two main technologies are used in Control valves: Adj. bolt Spring Diaphragm Plug Motorized Valves Pilot-Operated, Hydraulic Valves

4 Control Valves Motorized Valves the position of the valve is adjusted

5 Control Valves Hydraulic Valves the controlled value is adjusted

6 Control Functions trol Pressure Sustaining Pressure Reducing Level control Pump control Modula trol Flow control Surge Anticipating Relief valve Altitude control Pressure Each is mechanically-designed to achieve a different type of controlled parameter

7 Innovation Technology Progress Design and SCADA Technology Manual design and calculation. Hydraulic-Control Technology Manual Valving is the predominant regulating action

8 Innovation Technology Progress Design and SCADA Technology Continue with paper technology and manual design & calculations Hydraulic-Control Technology Pilot-operated valves become acceptable in controlling pressure, level and flow in water networks

9 Innovation Technology Progress Design and SCADA Technology Computerized calculations and control (mostly wired). Hydraulic-Control Technology Quality improvement and increased variety with same technology and increase in use of motorized valves

10 Innovation Technology Progress Design and SCADA Technology Computerized design and solvers, Radio control & monitoring, calibrators Hydraulic-Control Technology Further improved with same technology. + Implementation of electronically modulated PRVs PRV Controller

11 Innovation Technology Progress Design and SCADA Technology GIS, 3g\4g com, AMR, Cloudbase and Self-learning algorithms, IoT, Tablet tech. Hydraulic-Control Technology Most advancement is limited to biasing the adjustment of a PRV pilot-valve PRV Controller

12 Closing the Gap Increased use of electronics, smart algorithms and wireless technology Mostly mechanical & fixed set-value. Only PRVs are modulated (Just one control-function!)

13 Closing the Gap Electronically-Controlled Hydraulic Valves Nowadays a new concept is being adopted: Electronically-Controlled Valves Typical Features include: 1. Ability to execute any required control-function or combination of control functions 2. Reduce OPEX due to standardization of the control-devices regardless of the variety of control functions and simplicity of maintenance. 3. React in real-time with high-sensitivity

14 Closing the Gap Electronically-Controlled Hydraulic Valves Nowadays a new concept is being adopted: Electronically-Controlled Valves Typical Features include (cont.): 4. Low-power, battery-energized 5. No limitation on the ability to modulate each set-value separately 6. Controlling electronically-sensed parameters such as salinity, temperature etc. 7. Wired or wireless remote controlled (SCADA or other)

15 Closing the Gap Electronically-Controlled Hydraulic Valves trol Pressure Sustaining Pressure Reducing Level control Flow control Modula Any required control-function or combination of functions: Achieved with the same control trim

16 Closing the Gap Electronically-Controlled Hydraulic Valves Interface device & application Sensors providing feedback and reference Control-valve with controller as part of the pilot-trim Modules

17 Closing the Gap Electronically-Controlled Hydraulic Valves Controller Perform any function or combinations of thereof Power independent Variety of options for communication Real-time control Native-language config. and control Control-Valve Regulation Stability: From near-zero to high flow Versatility: can be used for a wide range of applications High reliability (materials, avoid dynamic sealing, corrosion-proof design ) & Simple and low-cost maintenability

18 Electronically-Controlled Hydraulic Valves When designing the future systems for better optimization: Not just downstream pressure, but any controlled parameter can be dynamic (inlet pressure, flow, level, salinity, water quality )

19 Electronically-Controlled Hydraulic Valves The regulation is continuous and in real-time: similar to mechanical pilot valve and different than motorized valve:

20 Example 1: Demand-Control- Valves (DCV) Combining PSV (optionally modulating S.P) with PRV in the boundaries between every two adjacent zones. The valve will never extract more water than the supporting network can supply Protects adjacent zones from a pressure drop in case a large break or exceptional high demand Can add flow-limitation, emergency remote-controlled opening or other functionalities Zone 2 40 Flow (l/sec); Pressure (mwc) Zone 1 Zone 3 Zone 4 10 Zone Flow (l/sec) P1 (mwc) P2-S.P (mwc) P2 (mwc)

21 Example 2: Excessive Flow Shut-off Excessive Flow Shut-off that has a modulating shut-off flow per the expected demand * The valve can be remotely controlled so to fully open or set to a higher setvalue during fire or other exceptional events that require such innervation

22 Example 3: Pressure- Management Pressure-Management: dynamically controlling the discharge pressure from a zone into a reservoir (PSV) Can be: Time-modulated; C.P-modulated; Remote-controlled Flow (l/sec) Flow (l/sec); Pressure (mwc) C.P (mwc) P1 (mwc) CP Max. Level 5 0 Tank level (m ) Min. Level Additional option: Level-modulated Flow-Control = Reducing the flow as the level rises, thus avoiding water-hammer

23 Example 4: Supplying Flow from Various Sources Batching two water sources which may have different qualities (such as different salinity or temperatures), into one with required set-value of mixture Cost optimization by using the lowest-cost out of multiple sources based on changing demand & supply conditions High Salinity Low salinity Allowed\Regulated Salinity

24 Example 4: Supplying Flow from Various Sources Batching two water sources which may have different qualities (such as different salinity or temperatures), into one with required set-value of mixture Cost optimization by using the lowest-cost out of multiple sources based on changing demand & supply conditions High Salinity Source A Lowest cost Source B Intermediate cost Allowed\Regulated Salinity Low salinity Source C High cost * Source cost and availability may change with time and dynamic conditions

25 Summary Today s technology enables new control devices to be used, that open the future for further optimization of water-systems, allowing designers greater flexibility than ever. Control valves are no longer limited to perform a fixed set of functions based on mechanical-logic pilot-valves. This allows the hydraulic-control to be designed in a way that considers its dynamic behavior: stabilizing it and increase its efficiency and reliability

26 Contact us for further information! Dorot Management Control Valves Ltd Assaf Heimann Applications Engineering & Customer Support Manager