Leslie Controls DKLO D1 & D4 .5-4 125/250 class - Manual (Page 6)

6
DKLO SERIES CODE SELECTION CHART
CLASS ORIFICE
SIZE
VALVE
SIZE
CONNEC-
TIONS
TRIM
MATERIAL
PACKING
ACTUATOR BENCH RANGE
D 1 T E 8 1 1 3 6 R B
1 2 3 4 5 6 7 8 9 10 11
Class –
Position 1&2
D1 = Bronze
D4 = Cast Iron Connections –
Position 5
2 = 125 Flg
8 = Unions Actuator –
Position 8 & 9
01 = None
36 = 36 sq. in.
60 = 60 sq. in.
Bench Range – Position 11 & 12
Orifice Size –
Position 3
A
B
C
E
T
Valve Size –
Position 4
C = 1/2
D = 3/4
E = 1
F = 1-1/4
G = 1-1/2
H = 2
J = 2-1/2
K = 3
M = 4
Trim Material –
Position 6
1 = Metal
Packing –
Position 7
1 = V-ring
AA = None
DKLO only
DA = 3-12 Dir 36
DB = 3-9 Dir 36
RA = 6-15 Rev 36
RB = 9-15 Rev 36
RC = 12-15 Rev 36
RD = 13-15 Rev 36
DF = 3-10 Dir 60
DG = 3-7 Dir 60
RG = 12-15 Rev 60
RH = 13-15 Rev 60
DKLO-C only
DH = 3-8 Dir 60
RH = 10-15 Rev 60
RQ = 12-15 Rev 60
RT = 22-30 Rev 60
MAINTENANCE
REMOVAL OF ACTUATOR FROM VALVE
BODY ASSEMBLY
Close inlet and outlet stop valves. Be sure body is not
under pressure. Remove all accessories from control valve.
Refer to Figure 2.
REVERSE ACTING PNEUMATIC
ACTUATOR
Loosen stem nuts (24) and move to approximately 1/3
down valve stem. Re-tighten being careful not to move
valve stem. Energize actuator with air to lift the plug off
the seat. Disengage lock nut (26) from bonnet (25). De-
energize actuator. The actuator and yoke should move
away from bonnet. Lift actuator and yoke assembly along
with plug (39) off the seat. With an adjustable wrench,
unthread valve stem from actuator stem (Fig.6, #16) until
valve stem is disengaged from actuator stem. Remove stem
nuts, indicator, packing nut and lock nut.
DIRECT ACTING PNEUMATIC ACTUATOR
Energize actuator with air slightly (in case of back
seating).
Loosen stem nuts (24) and re-tighten
approximately 1/8” away from actuator stem (Fig. 6, #16).
Disengage lock nut (26) from bonnet (25). With and
adjustable wrench, unscrew valve stem from actuator stem.
When valve stem reaches seat, lift actuator (to prevent
galling seat and plug). Remove stem nuts, indicator and
lock nut.
DISASSEMBLY OF VALVE BODY
Remove stem nuts (24), indicator (32) and lock nut (26).
Lift yoke off bonnet (25). To complete body disassembly,
unscrew bonnet for D1 and cap (42) for D4. For D4
remove bonnet nuts (34) and lift off blind flange (35),
bonnet, stem and plug assembly (37). Remove gasket (36).
A new gasket should be installed each time valve body is
disassembled. Turn stem and plug assembly out of bonnet
through packing. Replace packing if necessary. All parts
should be inspected for wear and cleaned thoroughly
before re-assembling valve body.
DISASSEMBLY OF ACTUATOR
Remove actuator from valve. Remove regular casing bolts
(4) and casing nuts (5). Gradually loosen nuts on
remaining long casing bolts (14) to allow pre-compression
of actuator springs. Remove upper casing (2). Pull actuator
stem (16), along with diaphragm (15), springs (3) and
piston (13), out through bushing (7). Place a wrench on the