MWEA MAINTENANCE SEMINAR SPECIALTY VALVES POWER GLOBES
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1 MWEA MAINTENANCE SEMINAR SPECIALTY VALVES POWER GLOBES J O H N G. H U N T E R Types of Valves P A U L M A R C H I Accessories Principals of Operation Maintenance Control Valve Types Common Problems Key Features Troubleshooting
2 HYDRAULIC PILOT CONTROLLED GLOBE VALVES 1. DIAPHRAGM CONTROL VALVES 2. PISTON CONTROL VALVES WE ARE GOING TO REVIEW THESE TWO STYLES TODAY BOTH STYLES ARE VERY SIMILAR
3 PILOT CONTROLLED CONTROL VALVES P I S T O N V A L V E D E S I G N D I A P H R A G M D E S I G N
4 DIAPHRAGM & PISTON DESIGNS BOTH VALVE DESIGNS OPERATE THE SAME WAY PILOTS READ THE INLET / OUTLET PRESSURES ON THE VALVE AND CONTROL THE WATER GOING ONTO THE BONNET OR COMING OFF THE BONNET
5 The upper chamber controls the valve The pilot valve controls the amount of water on the bonnet by reading the inlet or outlet pressures THE UPPER CHAMBER How is this done?
6 PRINCIPAL OF OPERATION
7 PRINCIPAL OF OPERATION
8 VALVE WITHOUT A PILOT
9 PILOT CONTROL P R E S S U R E R E D U C I N G P R E S S U R E R E L I E F
10 CONTROL PILOTS P R E S S U R E R E D U C I N G P R E S S U R E R E L I E F
11 BY ADDING THE PILOT WE HAVE CONTROL
12 KEY FEATURES TO INCLUDE USING YOUR CONTROL VALVES 1. Require NSF approved coatings on the interior & exterior 2. Stainless bolting is always a great option for maintenance 3. Gauges in your system these are options that can be included in the valve pilot system. You need to be able to read system pressures 3. Position indicators these valves have this option and they are a great feature 4. A new law goes into effect January 5 th 2014 Act amends the Safe Drinking Act by reducing the allowable lead from 8.0% to.25% this change can effect the seat and pilot trims on most control valves more stainless and less bronze
13 KEY FEATURES C O A T I N G S S T A I N L E S S B O L T I N G
14 KEY FEATURES TO INCLUDE
15 TYPES OF CONTROL VALVES P R E S S U R E R E D U C I N G Pilot line on the inlet The pilot reads the inlet / outlet and is connected to the bonnet What is missing from this photo? P R E S S U R E R E L I E F
16 TYPES OF CONTROL VALVES P R V R E Q U I R E M E N T S A position indicator is always needed Gauges are also needed either on the valve or on the pipeline
17 We are finding that todays systems are changing and controls are changing as well. Today we have communities that are looking for a hands on control motorized pilots that are controlled by the in house SCADA system. TYPES OF CONTROL VALVES
18 Motorized Pilots MOTORIZED PILOTS 4-20mADC SCADA Control IP68 Rated
19 TYPES OF CONTROL VALVES B O O S T E R P U M P C O N T R O L V A L V E These valves are normally closed on pump start-up They are slowing opened & closed during operation and have a built-in sliding valve which closes on power failure On shut-down, the solenoid is deenergized and the valve closes and the closing limit switch turns the pump off
20 BOOSTER PUMP CONTROL VALVES
21 TYPES OF CONTROL VALVES P R E S S U R E R E L I E F Relief valves can be set up for surge relief as well as upstream pressure sustaining This pilot is sensing the inlet pressure
22 Many surge relief valves in systems are provided with angle pattern bodies. TYPES OF CONTROL VALVES They are piloted to control or maintain a specific inlet pressure They are designed to relieve any over pressure
23 Metering control valves have two main solenoids one allows water off the bonnet The other to put water on the bonnet This valve will have a position transmitter connected to a flow meter of pressure transmitter this valve controls flow & pressure TYPES OF CONTROL VALVES
24 Metering Valves 1. Dual solenoids 2. Dual speed controls 3. Dual bypass pilots 4. Transmitters that communicate with SCADA 5. Used in flow control and pressure control applications TYPES OF CONTROL VALVES
25 Metering Valves TYPES OF CONTROL VALVES Metering valves can have other functions as well This metering valve has an altitude control pilot This added pilot will override the metering function and close the main valve when a level is achieved
26 METERING CONTROL VALVE
27 Altitude Control Valves These valves are set up for one way or two way flow TYPES OF CONTROL VALVES They fill the reservoir or storage tank and can fully close. The two way valve will have a delay pilot which allows the valve to open when the inlet line pressure falls the valve opens and allows the reservoir to drain back into the system
28 RATE OF FLOW This valve has many type of control pilots available TYPES OF CONTROL VALVES ROF comes with a downstream orifice plate sized for the application requirements Standard hydraulic pilot control as well as SCADA control
29 METERING CONTROL VALVES Flow Meters Are Now Available From Some Manufacturers Larger Body Taps Are Required The Valve Manufacturer Must Provide Meters With The Proper Calibration For the Model And Size Of Valve
30 TYPES OF CONTROL VALVES
31 MWEA VALVE SEMINAR PILOT ACTUATED GLOBE / ANGLE PATTERN VALVES HAVE MANY OPTIONS. ELECTRONIC CONTROLS AS WELL AS HYDRAULIC IT S ONE OF THOSE PRODUCTS THAT IF YOU DON T SEE IT JUST ASK - WE PROBABLY HAVE MADE VALVES JUST LIKE IT THANK YOU
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