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FIGURE 790
CRYOTREE™
Our CryoTree™ assemblies are
manufactured for use on stationary
cryogenic storage tanks to isolate safety
relief valves and rupture discs in the event
they need to be serviced. Utilizing this
system eliminates the need to shut down
and evacuate the tank for service. This
modular assembly provides for just a single
connection to the internal tank piping.
APPLICA TIONS DATA
●On stationary cryogenic storage tanks to isolate safety relief
valves and rupture discs in the event they need to be serviced
APPLICABLE CODES
●
CGA S-1.2 and S-1.3.
●
ASME Sec.VIII
●
API 527
●
ANSI B16.18
●
ANSI B31.1
FIGURE 790
CRYOTREE™ ASSEMBLY
SIZES 3⁄4" to 11⁄2"
PRESSURES to 400 psig at 400ºF
●Dual safety relief systems engineered for
maximum safety and reliability
●Easy system installation
●Includes high capacity safety relief valves,
full flow diverting valve, rupture discs,
bleed valves, and related piping assembled
●Standardized components
●Low maintenance
●Eliminates the need to shut down and
evacuate the tank for service
●Minimizes pressure drop in system
●Cleaned and packaged for use in O
2
service
in compliance with the CGA specification
G-4.1
●Sealed in 6 mil poly bags to eliminate
contamination prior to installation
●Handle indicates flow direction
M
ODELS
●790 - Bronze CryoTree™
790GFDEAB–EB250
CODE SELECTION CHART
1234567891011121314
Model Valve Orifice Top Bottom Side Mat’l SRV SRV Set Pressure
Size Port Port Port Outlet Orifice
Orifice -
Position 5
F = Full
Top Port -
Position 6
D=
3
⁄
4
E= 1
F= 1
1
⁄
4
G= 11⁄
2
Bottom Port -
Position 7
A=
1
⁄
4
B= 3⁄
8
C= 1⁄2
D= 3⁄
4
E= 1
F= 1
1
⁄4
Model -
Position 1, 2 & 3
790 = CryoTree™
Valve Size -
Position 4
D=
3
⁄4
E= 1
G= 1
1
⁄
2
Side Port -
Position 8
A=
1
⁄4
Material Position 9
B = Bronze w/316 Stem
SRV Outlet -
Position 10
D=
3
⁄
4
E= 1
F= 1
1
⁄
4
G= 11⁄
2
H= 2
SRV Orifice -
Position 11
A
B
C
D
E
Set Pressure -
Position 12, 13 & 14
__ __ __ = Actual Setting
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FIGURE 790
CRYOTREE™
FIGURE 790
CRYOTREE™ ASSEMBLY
SPECIFICATION
The valve shall be utilized for applications that requires full flow
manifolds. The valve shall have 180 degrees of operation. The valve
shall contain two safety relief valves, two rupture discs and two bleed
valves. The handle shall indicate the direction of flow. The stem shall
be blow out proof and contain V-ring packing material. The valve
shall be cleaned to CGA G-4.1.
MA TERIALS
Body ………………………………………………Bronze B62
End Plate …………………………………………Bronze B62
Ball ………………………………………………………Bronze
Stem ……………………………………………………316SS
Inlet Pipe…………………………304SS ASTM 312 Schedule
Bleed Port Valve …………………………………………Brass
Rupture Disk………………………………………Brass/Monel
Bolts ………………………………………………304SS A193
SIZE A B* C
D
3
⁄
4
F 7.3 22.5 14.8 7.75
(20) (185.4) (571.5) (375.9) (196.9)
1F 8.7 25.7 16.5 12.00
(25) (221.0) (652.8) (419.1) (304.8)
11⁄
2
F 10.2 27.3 18.3 12.00
(40) (259.1) (693.4) (464.8) (304.8)
Safety Relief Valve Outlet Rupture Disc Outlet
Cv@C
v
@C
v
@C
v
@
Size
mid position full open mid position full open
(inches) (90°) (180°) (90°) (180°)
3
⁄
4
F 9.2 8.2 10.7 8.1
1F 25.3 18.3 16.4 14.0
1
1
⁄
2
F 40.0 30.4 23.8 22.2
Flows may vary slightly due to outlet connection sizes.
DIMENSIONS inches (mm)
High Flow Diverter Valve CvValues*
11⁄2F
3
⁄4F1F
Dimensions for reference only.
* Height varies depending on valve.
High Flow Diverter Valve CvGraph
CryoTree Confguration Chart
790DFxxxB-xx
3/4" CryoTree
Largest Configuration Possible = 790DFDCDB-GC
Top = 3/4” NPT Max
Bottom = 1/2” NPT Max
Side = 3/4” NPT Max (1/4" recommended)
SRV Outlet = 1
1
⁄
2” Max
SRV Orifice = C Max
790EFxxxB-xx
1” CryoTree
Largest Configuration Possible = 790EFFEEB-HD
Top = 1
1
⁄
4” NPT Max
Bottom = 1” NPT Max
Side = 1” NPT Max (1/4" recommended)
SRV Outlet = 2” Max
SRV Orifice = D Max
790GFxxxB-xx
11⁄
2” CryoTree
Largest Configuration Possible = 790GFGFFB-JE
Top = 1
1
⁄2” NPT Max
Bottom = 1
1
⁄4” NPT Max
Side = 11⁄4” NPT Max (1/4" recommended)
SRV Outlet = 21⁄
2” Max
SRV Orifice = E Max
Refer to valve information for maximum set pressure.
50.0
45.0
40.0
35.0
30.0
25.0
C V
20.0
15.0
10.0
5.0
0.0
10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0
P E R C E N T O P E N
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