Emerson Y696 Data Sheet
Bulletin 74.2:Y696
Type Y696 Vapor Recovery Regulator
January 2010
W5996
Figure 1. Type Y696 Vapor Recovery Regulator
Features
• Simplicity—Direct-operated, straight forward stem and
lever design minimizes the number of parts while
providing excellent regulation of pressure.
• Precision Control—Large diaphragm area provides very
accurate throttling control at low set pressures.
• Rugged Construction—Heavy duty castings and
internal parts are designed to lessen vibration and shock.
• Ease of Inspection and Maintenance—The union nut
connection permits maintenance or inspection of critical
parts without removing the body from the line.
• Variety of Construction Materials—Body and lower
casing are available in cast iron, steel, stainless steel,
or Hastelloy® C. Spring case is available in cast iron,
steel, or stainless steel. Trim is available in stainless
steel or Hastelloy® C.
Introduction
The Accu-Pressure™ Type Y696 is a direct-operated vapor
recovery regulator with internal registration, requiring no
downstream control line. This regulator is used to sense
an increase vessel pressure and vent excessive internal
tank pressure to an appropriate vapor recovery disposal
or reclamation system. However, inlet pressures, outlet
pressures, and other performance characteristics vary
according to construction.
Hastelloy® C is a mark owned by Haynes Internatio nal, Inc.
D102054X012
www.sherregulators.com
Bulletin 74.2:Y696
Specications
Body Size and End Connection Style
(1)
See Table 1
Maximum Allowable Inlet and Outlet Pressure
15 psig (1,0 bar)
Orice Diameter
1-inch (25 mm)
Control Pressure Ranges
See Table 2
Flow Capacities
See Table 7
Wide-Open Flow Coefcients
CV: 14.7
Cg: 515
C1: 35
Pressure Registration
Internal
Vent Connections
1/4 NPT
Spring Case Connection
1/4 NPT
Common Services and Material Compatibility
See Tables 3 and 4
Temperature Capabilities
Nitrile (NBR): -20° to 180°F (-29° to 82°C)
(2)
Fluorocarbon (FKM): 40° to 300°F (4° to 149°C)
Peruoroelastomer (FFKM): 0° to 300°F (-18ۜ° to 149°C)
(2)
Ethylenepropylene (EPDM): -20° to 275°F (-29° to 135°C)
Approximate Weight
Cast iron: 45 pounds (20 kg)
Steel and Stainless Steel: 57 pounds (26 kg)
Construction Materials
Body and Union Nut: Cast iron, Steel,
CF8M Stainless steel, or Hastelloy® C
Spring Case: Cast iron, Steel, or CF8M Stainless steel
Diaphragm Case Assembly: Cast iron, Steel,
CF8M Stainless steel, or Hastelloy® C
Control Spring, Control Spring Seat, and
Diaphragm Plate: Plated Steel
Diaphragm: Nitrile (NBR) (standard),
Fluorocarbon (FKM), or Ethylenepropylene (EPDM)
Disk Assembly: 303 Stainless steel disk holder
with Nitrile (NBR) or Ethylenepropylene (EDPM) disk;
316 Stainless steel disk holder with Nitrile (NBR),
Fluorocarbon (FKM), Peruoroelastormer (FFKM), or
Polytetrauoroethylene (PTFE) disk; or Hastelloy® C
disk holder with PTFE disk
Orice, Pusher Post, Lever Assembly, Stem,
and Cotter Pin: 303 Stainless steel,
316 Stainless steel, or Hastelloy® C
Gaskets: Composition
1. End connections for other than U.S. standard can usually be provided, consult your local Sales Ofce.
2. The pressure/temperature limits in this Bulletin or any applicable standard limitation should not be exceeded.
Table 1. Body Sizes and End Connection Style
BODY SIZE,
NPS (DN)
1-1/2 and 2 (40 and 50) NPT
Cast Iron Steel Stainless Steel Hastelloy® C
NPT, SWE, CL150 RF,
CL300 RF, PN 16/25/40
BODY MATERIAL
NPT, SWE, CL150 RF,
CL300 RF, PN 16/25/40
Table 2. Control Pressure Ranges
CONTROL PRESSURE RANGE
2 to 5-inches w.c.
5 to 15-inches w.c.
8-inches w.c. to 1 psig
1 to 2.8 psig
2 to 3.5 psig
4 to 7 psig
1. Spring ranges based on spring case installed pointed down. When installed pointed up, spring range increases 2-inches w.c. (5 mbar).
2. Do not use Fluorocarbon (FKM) diaphragm with these springs at diaphragm temperatures lower than 60°F (16°C).
(5 to 12 mbar)
(12 to 37 mbar)
(20 to 69 mbar)
(69 mbar to 0,19 bar)
(0,14 to 0,24 bar)
(0,28 to 0,48 bar)
(1)(2)
(1)(2)
SPRING PART
NUMBER
1A200127022
1B766627062
0B019427052
0A081127202
0Y066427022
1H802427032
SPRING COLOR
Red
Gray
Dark Green
Orange
Green stripe
Red
SPRING WIRE DIAMETER,
INCHES (mm)
0.135 (3,43)
0.156 (3,96)
0.187 (4,75)
0.250 (6,35)
0.363 (9,22)
0.406 (10,3)
CL150 RF
SPRING FREE LENGTH,
INCHES (mm)
5.38 (137)
6.63 (168)
6.00 (152)
6.00 (152)
6.00 (152)
6.00 (152)
2
E0751
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Bulletin 74.2:Y696
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Figure 2. Operational Schematic
VAPOR RECOVERY
VACUUM SOURCE
VAPOR PRESSURE
LIQUID
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Figure 3. Principal of Operational Schematic
Principle of Operation
The Type Y696 vapor recovery regulator is used to maintain
a constant blanket (inlet) pressure or vessel pressure with
the outlet owing to a system whose pressure is lower than
that at the inlet.
When vessel pressure increases above the setpoint of the
regulator due to pumping in or thermal heating, the force
of the control spring is overcome by pressure acting on the
diaphragm. This moves the disk away from the orice allowing
gas to ow from the vessel to the vapor recovery system.
As vessel pressure is reduced, the force of the control
spring causes the disk to move toward the orice
decreasing the ow of gas out of the vessel. As vessel
pressure drops below the setpoint of the regulator, the disk
will seat against the orice shutting off the ow of gas.
Sizing Vapor Recovery Systems
To determine the capacity required, you must consider the
amount of blanketing gas that must be displaced from the
tank when either lling the vessel with liquid (pump-in) or the
expansion of tank vapors during atmospheric thermal heating.
Using the established procedures from American Petroleum
Institute Standard 2000 (API 2000), determine the required
ow rate for outbreathing.
3
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