Bray - Valvulas Control Rotativas
Bray - Valvulas Control Rotativas
Bray - Valvulas Control Rotativas
MEXICO
“Demystifying Control Rotary Valves”
14/Sep/2017
PRODUCT LINE
Introduction to Control Valves
Industrial Process Control
PRESSURE REGULATOR
•Packing
•Bonnet
•Body
•Stem
•Guide/Retainer
•Cage
•Plug
•Seat
Internal Types of Plug
Cv & Characterization
Linear
Valve
Cv =%
% Valve Travel
Globe Cage Guide
Cage
Plug
Seat
Components of a Control Valve
Special Applications
The common faucet (llave de agua) found in your home is an example of a valve that
controls the flow of water.
What is a Valve? How Does it Work?
By turning the handle (operator), you are varying the opening of the valve to control
flow.
Operator
Water
flow
What is a Valve? Other Uses
These two valves are designed to control the desired water temperature.
The two valves shown here allow us to mix the hot and cold water in order to get the
desired water temperature.
Hot Water Valve Operator
• Rotary
• Linear
Control Valves Types
Optional Coatings
Materials: • FKM
• Buna (Black & White) • TFE/EPDM
• EPDM • Chlorobutyl
S30 & S31 Valves
Two Piece Disc & Stem
• No O-Ring Seals under Disc Screws
• No Holes in Disc for Potential Leak
• Easier Disassembly (No Pins / Screws)
• Allows Application of Special Coatings
• Enables Disc to Self-Center on Stem
Applications
• Sulfuric Acid
• Hydrofluoric Acid (HF)
• Chlorine
• Hydrochloric Acid
• Hydrochloride
• Demineralized Water
• Other Corrosive or Toxic Applications
Concentric Butterfly Valve
Advantages
• Low cost per CV installed.
• Simple design with cast iron body coated elastomer
(natural rubber, EPDM, Teflon).
• Concentric metallic disc or coating.
• Excellent sealing class with ZERO leak - API 598.
• Good performance in corrosive application with low
operating costs and ceramic option for severe service of
erosion.
• Connection wafer, lug or double flange.
• Sizes from 1 "to 120".
• Easy installation and low maintenance cost with short list
of spare parts.
ROTARY CONTROL VALVES
SEVERE SERVICE BUTTERFLY
ECCENTRIC DISC
TYPE 39
Introducing
Bray Series 39
SEVERE SERVICE VALVE
• The S39 is a flow control valve for ultra
erosive applications.
• This valve has a swing through seat designed
for control (not isolation).
2” to 6” Wafer
8” and above
Double Flanged
Body Coating
Nylon 11
Internal Components
-Flexible
Bending
Strength 850 mPa.
-Flexible
Bending Strength
1150 mPa.
-Flexible
Bending Strength
1150 mPa.
WHY…
The Single Offset Disc Profile
Allows
• A smooth front face allows high velocity
particles to cross it without causing localized
erosion.
• Due to the cam like opening action a majority
of flow passes by the leading edge of the disc.
• Erosion is kept away from the disc / stem hub
areas.
0 Deg
As fluid velocity
reduces disc opens
both sides.
50 Deg
High Performance
Butterfly Valve.
Bi-Eccentric Butterfly Valve
Advantages
• Aerodynamic disc with flow rate curve set to control up to 70
degrees with 100:1 turndown.
• Eccentricity disc effect without contact with the seat after
opening 2-3 degrees and less dynamic torque.
• Less wear on the seat surface.
• Excellent metal seat leak Class IV.
• Larger flow capacity (Cv) than segmented (> than 4") and
eccentric plug valves.
• Wide options of valve body and trim materials (steel alloys).
• Cryogenic and high temperature application (-196 °C up to 482
° C).
• Lower weight and compact design with connection options
wafer, Lug and double flange for sizes 2.1 / 2 "- 60" / 150 # ~
600 #.
High Performance Buttefly Valve Double Off-Set
Benefits of double
offset design “cam”
effect of disc rotation
Longer seat life
• Normal Service
Seal Bubble-Tight in Both Directions
Resilient Seat & Metal Seat Contact Disc Edge
Bray/McCannalok
Special Options
• Torque Seated
• Zero Leakage
• Inherently Fire-Safe
• No Rubbing
• No Friction
• No Sticking
• Long Life
METAL TO METAL SEALING PRINCIPLE
SIZES AVAILABLE:
3”- 48” (80mm - 1200mm)
ASME CLASS:
150 300 600
DESIGN TEMPERATURE:
-58ºF to 842ºF (-50ºC to 450ºC)
OPERATING TEMPERATURE:
-58ºF to 700ºF (-50ºC to 700ºC)
Bubbletight in accordance with: ANSI B16.104 cl.VI / API 598 / MSS SP61
ALLOW LEAKAGE.
.
Standard V-Port Balls
P2 P1
dP
V-Ball
Inherent Characteristics
P1 P2
dP
Z
Flow
Test Valve
FT
Flow
Controller Transmitter
Pump
Characterized V-Port Ball
Advantages
• The valve has excellent performance with process control.
• Unique design in traditional full bore ball valve that allows the
choice of an appropriate CV to flow control with many options
for the same diameter.
• High turndown ratio of flow control (up to 500: 1) better than
segmented ball, eccentric plug, butterfly bi-eccentric and globe
valves.
• Internal option within the standard full bore valves line.
• Good relation cost X segmented ball up to 4 ".
• Sizes 1/4 "to 12" with screwed, welded and flanged valve
connections.
• Shutoff leak Class IV and VI - FCI 70-2.
• Easy installation and low maintenance cost with short list of
spare parts.
Characterized V-Ball Application
V-Ball Applications
Flow Control
Great With:
Level Control
Temperature Control
Great in Some
Steam Control
Applications:
Pressure Control
Control Range
• Tek-Fil (Standard)
• PEEK
• Metal
•
Characterized V-Ball
Exceptional Characterized Control
Linear (slotted or 15º ball)
Custom
High Rangeability
.
Rotary Control Valve
Type Segmented Ball Valve Serie 19
.
Segmented Ball Valve Serie 19
Advantages
• Second generation of segmented ball valve with inherent
characteristic of flow equal percent and 300:1 rangeability.
• Excellent performance with viscous fluids and moderate dirty
applications.
• Soft and metal seat options with shutoff class VI and IV.
• 316 stainless steel ball with hard chrome plating as standard.
• Can work in control or on-off.
• Standard valve control in Pulp & Paper with increasing use in
other segments of Chemical & Petrochemical and Oil & Gas.
• Sizes from 1 "to 12" wafer and flanges 150 # / 300 # and RF.
• Lower cost per CV installed than globe valve.
• Easy mounting on pipe line and skids due the low weight and
small size.
• Low maintenance costs with small spare parts list.
S19
S19 Flanged
Wafer
Note: For Higher Delta P values and custom Cv requirements, contact Flow-Tek factory
Series 19 Segmented Ball Valve
CFD plot showing the high velocity stream causing damage to the valve body
Series 19L
Solution
After studying the analysis results, Bray proposed the following changes which would enhance
the life of the valve.
15
12 - 15 dBA maximum
Thermal
High temperature 10
applications will have
insulation anyway. 5
• Acoustical Insulation
0
8 to 10 dBA per inch 1 2 3 4
Insulation Thickness
24 to 27 dBA maximum
(Inches)
161
ROTARY CONTROL VALVES
HIGH PRESSURE RECOVERY FACTOR FL
LIQUID FLOW
LOW-MODERATE PRESSURE DROP
Understanding Cavitation Basic Fluid Mechanic
Concepts
• Vena Contracta
• Vapor Pressure
Flow Through a Restriction
Vena Contracta:
Point downstream of the
restriction where the
process is at the Highest
Velocity and Lowest
Pressure.
Valve Recovery Factor, FL
A dimensionless expression
of the pressure recovery
ratio in a control valve.
FL = P1 - P2
P1 - Pvc
FL Different Control Valves Types
P1
P2
FL = 0.90
Valve with high FL
has lower pressure FL = 0.60
drop in PVC (globe) Valve with low FL
has higher
pressure drop in
PVC (rotary)
Pvc
Control Globe Valve Design
P1
Static Cavitation
Pressure Sub Critical
P2
Pv
Valve Recovery Factor, FL
FL = .91 = LOW RECOVERY (Globe Valve)
Subcritical
Static
Pressure Cavitating
P1
Vapor Pressure
Flashing
Onshore
Production & Gas Storage,
Processing Compression, & Transporation
Offshore
Production
Liquefied
Natural Gas (LNG) Oil Refining
Transportation
Plastics
Toys
Electronics Casings
Bottles
Fabrics
Pulp & Paper
Other Industries: Pharmaceuticals and Food &
Beverage Processing
Mining and Steel
Ethanol
PREGUNTAS?
GRACIAS