Pipeline ancillaries Disc, split disc and wafer check valves
10
Pressure/temperature limits
A E
B
C
Steam saturation curve
D F
Pressure bar g
Only the DCV3LT can be used down to -60 °C
The product must not be used in this region. Use either a DCV3 with high temperature spring or DCV3/DCV3LT without spring for use in this area.
A-B-F DCV3 without spring and with high temperature spring. A-B-D DCV3LT without spring. E-C-F DCV3 with standard spring and heavy duty spring. E-C-D DCV3LT with standard spring and heavy duty spring.
Please note: The figures displayed are only relevant when a metal-to-metal seat is used. If Viton or EPDM seats are used the product is restricted to the limits of the seat material chosen.
Body design conditions
PN40
PMA Maximum allowable pressure
40 bar g @ 50 °C
TMA Maximum allowable temperature
400 °C @ 31.2 bar g
DCV3
-10 °C
Minimum allowable temperature
DCV3LT
-60 °C
7.5.8
PMO Maximum operating pressure (metal-to-metal seat)
40 bar g @ 50 °C
Standard spring (including Food+ metal seat)
300 °C @ 33.3 bar g
Maximum operating temperature
Heavy duty spring (including Food+ metal seat)
300 °C @ 33.3 bar g
TMO
High temperature spring (including Food+ metal seat) DCV3 only
400 °C @ 31.2 bar g
Without spring (including Food+ metal seat)
400 °C @ 31.2 bar g
DCV3
-10 °C
Minimum operating temperature Note: For lower operating temperatures consult Spirax Sarco
DCV3LT
-60 °C
10.5 11
Viton seat
-25 °C to +205 °C
Temperature limits
EPDM seat (including Food+ EPDM seat)
-40 °C to +120 °C
Designed for a maximum cold hydraulic test pressure of
60 bar g
TI-P134-50 CMGT Issue 12
Page 3 of 5
DCV3, DCV3LT and DCV3 Food+ Disc Check Valves
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