Fillable Printable 334 Data Sheet
Fillable Printable 334 Data Sheet
334 Data Sheet
Steam Specifications
Saturated Steam
°FP.S.I.G.
0
15
50
100
150
200
212
250
298
338
366
388
250
300
350
400
500
600
406
421
435
448
470
489
Steam Rating with ST Seats
Valve
Size
1/2" F.B.
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
P.S.I.G.
425
425
400
350
325
300
250
°F
455
455
447
435
428
424
406
Is an exclusive ball seating material that extends length of
service from three to five times over conventional seats.
ST is particularly recommended for use in high pressure
steam lines, thermal fluid lines, or for any media having
widely variable or excessive temperatures. ST seats can
withstand temperatures to 550°F, pressures to 1440 psi and
continuous saturated steam in excess of 450 psig.
ST Seat
Seat Material Specifications
Name
PCTFE
RTFE
ST
Delrin
UHMWPE
PEEK
Material
TFE + 15% carbon
TFM Polytetrafluoroethlene
TFE +
ekonol / carbon / graphite
Acetal Homopolymer
Polyethylene
Poly Ether Ether Ketone
Temperature (°F) Pressure (Max)
-20 to 425°F
-20 to 425°F
-20 to 550°F
-60 to 180°F
-60 to 200°F
0 to 600°F
1440 psi
1000 psi
1440 psi
3000 psi (up to 3/4")
1500 psi
4000 psi (up to 1/2")
334 Data Sheet
NOTE: This table is provided as an indication of service range.
Not all seats are considered applicable to high purity service
Chlorotrifluoroethylene
-400 to 400°F 3800 psi
Pressure (PSI)
-100
-50 100 150
350300
250200
500450400 550
Delrin-AF
ST 1/4" ~ 2"
0
15
50
100
200
250
300
350
400
450
150
1440
550
600
500
2000
3000
500
Temperature (F)
UHMWPE 1/4" ~ 2"
UHMWPE 2-1/2"
4000
5000
600
PEEK 1/4" ~ 2"
TFM 1/4" ~ 2"
-400
5500
PCTFE 1/4" ~ 1"
PCTFE 1-1/4" ~ 2"
PCTFE 2-1/2"
1000
RTFE 1/4" ~ 2"
Saturated Steam Curve
750
PEEK 2-1/2"
2500 psi (1")
2000 psi (1-1/4" ~ 2-1/2")
3500 psi (3/4" ~ 1")
3000 psi (1-1/4" ~ 2")
