Bestobell Steam TS22 Series - Manual (Page 4)

Replacing Element/Valve Assembly
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.bestobellsteamtraps.com Bulletin IM-DELTAIM-0608
Cover
When needed, the Bestobell trap can be readily over-
hauled, by replacing the Delta control element as a
complete assembly. A new factory replacement control
element and gasket should always be used as this will
be correctly calibrated to restore your trap to its original
efficiency.
Before removing the cover, the trap must be isolated 1.
from both live steam lines and condensate return
lines, and internal pressure in the trap should be
relieved via venting to atmosphere or by cooling the
trap to ambient temperature.
Loosen and remove the cover bolts and cover. (Due
2.
to long service lift between maintenance, the cover
bolts may become rusted in position. A clearance is
provided between the cover and body to allow the
use of a hack saw for removal).
Loosening the bimetal locknut enables insertion of
3.
an open-end wrench under the bimetal to free the
valve seat. Unscrew the valve seat from the body.
Before installing the new element/valve assembly,
4.
clean the valve seating face on the body with a wire
brush. Inspect to ensure that all gasket seating sur-
faces are undamaged.
The replacement element assembly is factory pre-
5.
set. It is vital that, during installation, the adjusting
nut and locknut on the spindle are not disturbed.
Unscrew the bimetal locknut to allow a wrench to be
6.
placed between the bimetal and body for tightening
of the seat into the body. Install the gasket on the
base, and screw the valve seat into the body and
tighten to the torque values shown in the Torque
Value Table.
Line up the bimetal with the inlet and outlet ports to
7.
ensure clearance once the cover is replaced, then
tighten the bimetal locknut. (Note: very small control
elements may not have bimetal locknuts).
Before replacing the cover, clean the cover gas-
8.
keting faces thoroughly and insert an appropriate
replacement cover gasket.
Replace the cover and bolts wit the bolt heads on
9.
the cover side and hand-tighten the nuts. Torque the
cover bolts in two stages: initially to 50% and finally
to the full values shown in the Torque Value Table. At
each stage tighten in the diagonal pattern shown on
page 1.v
Bimetal
Spindle
Locknut
Retainer Nut
Bimetal
Locknut
Control
Element
Assembly
(23-XX)
C/E Gasket (16-XX)
Cover Gasket (11-XX)
Valve Seating Face
Body
Strainer Gasket (16-XX)
Strainer Cap or “DTC”
Strainer Cap (15-XX)
General Maintenance
Although the Bestobell steam trap is simple and rugged
with only two moving parts, it is a mechanical device for
which routine inspection and maintenance is needed.
The trap must always be isolated before any attempt is
made to dismantle it.
Under normal operation, the only item that needs atten-
tion is the strainer which should be inspected periodi-
cally by removing the strainer cap and extracting the
strainer screen. It should then be cleaned and replaced
using a new strainer cap gasket.
Where plan conditions dictate frequent strainer clean-
ing, the fitting of a double threaded strainer cap (DTC)
and a blowdown valve is recommended in place of the
standard strainer cap to allow cleaning under operating
conditions. When a blowdown valve is installed, it should
be periodically opened for 3 to 5 seconds to blow out
the sludge and dirt from the strainer.
For maximum design pressure/temperature ratings, please review markings. Additionally, the maximum pressure ratings listed in
Directive 97/23/EC, Annex II, Tables 6,7,8 and 9 for products as described in Article 3, Paragraph 3 also apply to this product.