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02
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12
IOM
Model: 42T
PAGE 2 OF 1
Safety First
BERMAD believes that the safety of personnel working with and around our equipment is the most important
consideration. Please read all safety information below and from any other relevant source before attempting to perform
any maintenance function. Comply with all approved and established precautions for working with your type of equipment
and/or environment. Authorized personnel should perform all maintenance tasks.
Prior to performing a procedure, read it through to the end and understand it. If anything is not clear, ask the appropriate
authority. When performing a procedure, follow the steps in succession without omission.
1. Description
Bermad 42T Pressure-Reducing Valve is a pilot-operated, diaphragm-actuated, straight-through flow type with low
pressure-loss. It is an automatic pressure control valve that reduces higher inlet pressure to lower constant outlet pressure
regardless of fluctuating flow-rates and/or varying inlet pressure.
2.
Pressure
and Flow Ratings
The Bermad 42T pressure-reducing valves size 3”, 4”, 6", 8" and 10" are rated for the following pressure and flow
capacities detailed in table 1.
Table 1: Pressure Ratings and Flow Capacity
Valve Size in (mm)
3” (80)
4” (100)
6” (150)
8” (200)
10” (250)
Max. Inlet pressure
bar (psi)
25
(365)
25
(365)
25
(365)
25
(365)
25
(365)
Outlet pressure setting range, bar
(psi)
2 - 12
(30-175)
2 - 12
(30-175)
2 - 12
(30-175)
2 - 12
(30-175)
2 - 12
(30-175)
Max. recommended flow
m3/h (GPM)
82
(360)
145
(640)
330
(1450)
580
(2570)
910
(4000)
Pilot Valve model
2-PB
2-PB
2-PB
2-UL
2-UL
Min. recommended Pressure
Relief Valve Size, inch (mm)
2"
(50)
2"
(50)
3"
(80)
3"
(80)
4"
(100)
3. Head Loss
3.1
The minimum
∆
P across the valve is 0.4 bar (5.8 psi). In cases where the inlet pressure falls below or is equal to the
intended outlet pressure, the outlet pressure shall be determined according to the "Valve Outlet Pressure Fall-off
Chat".
3.2
In the case of zero (static) flow through the valve, the maximum increase in the downstream (outlet) pressure above
the set pressure of the valve will not exceed 0.5 bar (7.2 psi).
Table 2: Valve Head Loss Data
Note 1: Valve Equivalent Length Value (Steel Pipe), for use in hydraulically calculated system
Valve Size in (mm)
3” (80)
4” (100)
6” (150)
8” (200)
10” (250)
CV (Kv)
190
(219)
345
(398)
790
(912)
1160 ( 1340)
1430 ( 1652)
Leq
m (ft), see Note 1
8
(25)
8
(26)
13
(43)
27
(89)
55
(179)
