Type 99
6
Table 3.
Maximum Allowable Pressure Drop and Minimum Differential Pressures
Table 4.
Orifice Sizes
MAXIMuM
ALLOWABLE
PRESSuRE DROP
MAIN vALvE SPRINg
MINIMuM
DIFFERENTIAL
PRESSuRE FOR FuLL
STROKE
DISK MATERIAL
MAXIMuM
ORIFICE SIZE
(1)(5)
Part
Number
Wire Diameter Free Length
psig
bar
In.
mm
In.
mm
psig
bar
In.
mm
25
1.7
1C277127022 0.148 3.76
6.00
152
0.75
0.05
Nitrile (NBR), Fluorocarbon (FKM)
1-1/8
29
50
3.4
1N801927022 0.156 3.96
7.13
181
1.50
0.10
Neoprene (CR), Fluorocarbon (FKM)
1-1/8
29
150
10.3
1B883327022 0.187 4.75
6.63
168
3.00
0.21
Nitrile (NBR), Neoprene (CR),
Fluorocarbon (FKM)
1-1/8
29
175
(2)
12.1
(2)
1B883327022 0.187
4.75
6.63
168
3.00
0.21
Nitrile (NBR), Neoprene (CR),
Fluorocarbon (FKM)
7/8
22
250
17.2
1B883327022 0.187 4.75
6.63
168
3.00
0.21
Nitrile (NBR), Neoprene (CR),
Fluorocarbon (FKM)
7/8
22
300
20.7
0W019127022 0.281 7.22
6.00
152
10.0
0.69
Nylon (PA)
1-1/8
(3)
29
(3)
400
27.6
0W019127022 0.281 7.22
6.00
152
10.0
0.69
Nylon (PA)
7/8
22
1000
69.0
0W019127022 0.281 7.22
6.00
152
10.0
0.69
Nylon (PA)
1/2
(4)
13
(4)
1. Can use all orifice sizes up to maximum size listed. See Table 4.
2. CL125 FF flanged body only.
3. 1-1/8 in. / 29 mm is the only orifice available for 300 psig / 20.7 bar maximum inlet pressure regulator.
4. 1/2 in. / 13 mm is the only orifice available for 1000 psig / 69.0 bar maximum inlet pressure regulator.
5. O-ring seat construction is only available for 7/8 and 1-1/8 in. / 22 and 29 mm orifice sizes.
TRIM CONSTRuCTION
ORIFICE SIZE
In.
mm
Restricted capacity trim,
Straight bore —
Composition or Nylon (PA) disk seat only
1/2
(1)
3/4
13
(1)
19
Restricted capacity trim
(2)
,
Stepped bore —
Composition or Nylon (PA) disk seat only
7/8 x 3/8
7/8 x 1/2
7/8 x 5/8
22 x 10
22 x 13
22 x 16
Full capacity trim,
Composition or Nylon (PA) disk
or O-ring seat
7/8
1-1/8
22
29
1. 1/2 in. / 13 mm is the only orifice size available for 1000 psig / 69.0 bar maximum inlet pressure regulator.
2. Maximum inlet rating is equivalent to the 7/8 in. / 22 mm orifice.
The pilot valve diaphragm acts as a sealing member
for the loading chamber and as a balancing member
to the upper pilot diaphragm. These two diaphragms
are connected by a yoke so any pressure change in
the pilot chamber has little effect on the position of the
pilot valve. Therefore, the active diaphragm in the pilot
is the upper pilot diaphragm and the pressure on the
top side of this diaphragm opposes the force of the
pilot control spring.
Monitoring Systems
Monitoring regulators serve as overpressure protection
devices to limit system pressure in the event of an
open failure of a working regulator feeding the system.
Two methods of using Type 99 regulators in monitoring
applications are:
Normally, excess loading pressure slowly escapes
downstream around the bleed valve (Figure 2)
or through the relief valve body (Figure 3). Since
loading pressure needs to exceed outlet pressure
only moderately to stroke the main valve fully open,
a continued increase in loading pressure differential
extends the main diaphragm and the pusher post
assembly far enough to separate the bleed valve and
the bleed orifice. This action permits quick dumping of
excess loading pressure into the downstream system.
With a decrease in loading pressure on top of the main
diaphragm, the main spring exerts an upward force on
the diaphragm rod connected to the main diaphragm,
pulling it in an upward direction. This moves the main
valve towards the seat, decreasing the flow to the
downstream system.
