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
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
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
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
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?
PRINCIPAL OF OPERATION
PRINCIPAL OF OPERATION
VALVE WITHOUT A PILOT
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
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
BY ADDING THE PILOT WE HAVE CONTROL
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 111-380 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
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
KEY FEATURES TO INCLUDE
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
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
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
Motorized Pilots MOTORIZED PILOTS 4-20mADC SCADA Control IP68 Rated
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
BOOSTER PUMP CONTROL VALVES
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
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
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
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
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
METERING CONTROL VALVE
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
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
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
TYPES OF CONTROL VALVES
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