Compact

Accessories and Options
Heating jacket
Safety valves in systems which need to be protected from
media that are viscous, sticky, or have the tendency to
crystallize out of solution can be fitted with a heating jacket.
The heating jacket is constructed with a welded design and
covers the outlet body (Item 2), allowing heating medias (e. g.
steam, heat transfer oil, etc.) to pass through the space created.
For the balanced bellows design a separate heating of the
bonnet spacer (Item 11) is not necessary. Sufficient heat will
transfer to the spacer by convection, due to the compact
design of the Series 459.
G Inlet
A
G Outlet
If there is no risk of solidification of the media at the outlet a
safety valve without balanced bellows can be used as well.
C
C
Heating jacket
Type 459, Type 462
Type 459 HDD, Type 462 HDD
Actual Orifice diameter d 0 [mm] 6 9 13 17,5 6 9 13
Actual Orifice area A 0 [mm 2 ] 28,3 63,9 133 241 28,3 63,9 133
Actual Orifice diameter d 0 [inch] 0,236 0,345 0,512 0,689 0,236 0,345 0,512
Actual Orifice area A 0 [inch 2 ] 0,044 0,099 0,206 0,374 0,044 0,099 0,206
Option code
H29
H29
Materials
Outlet body 1.4404 1.4404
Standard material of LESER balanced
bellows is stainless steel 1.4571 / 316Ti.
316L
316L
Heating jacket 1.4541 1.4541
321 321
Couplings 1.4571 1.4571
316Ti
316Ti
Dimensions
Metric units A [mm] 40 40
C [mm] 67 77
US units A [inch] 1 9 / 16 1 9 / 16
C [inch] 2 5 / 8 3 1 / 16
Connections
G inlet Female thread DIN ISO 228-1 G 3 / 8 " G 3 / 8 "
Female thread ASME B1.20.1 NPT 3 / 8 " NPT 3 / 8 "
G outlet Female thread DIN ISO 228-1 3 / 8 " 3 / 8 "
Female thread ASME B1.20.1 NPT 3 / 8 " NPT 3 / 8 "
Operating conditions
max. operating pressure at 20°C [bar] 25 25
max. operating pressure at 210°C [bar] 18 18
max. operating pressure at 68°F [psig] 360 360
max. operating pressure at 410°F [psig] 260 260
For article no. and spare parts refer to spare part page of each type, please.
Options
LWN 480.01-E
09/11