IOM
Model: 43T Pressure Relief Valve
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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 43T Bermad Pressure- Relief Valve is a pilot-operated, diaphragm-actuated, straight-through flow type
with low pressure-loss. It is an automatic pressure control high performance valve.
The Model 43T Pressure-Relief Valve reliably relives excess system pressure to sump or atmosphere, meeting
all NFPA, UL and FM requirements
for fire pump service.
The Diaphragm Elastomeric design enables quick and smooth valve action. According to the inlet pressure, the
pilot valve regulates the main valve throttling. This valve requires only existing line pressure to operate.
1.1 Pressure and Flow ratings
1.1.1 Models and sizes covered by this document include the BERMAD 43T Pressure-Relief Valve, sizes:
3”, 4”, 6”, 8” and 10”. Sizing shall be not less than indicated in table 1.
Table 1: Relief Valve Sizing
The minimum relief valve size shall be as follows:
Pump Flow Capacity
Min Relief Valve Size
GPM L/min
(m3/h)
inch (mm)
400 - 500
1515 – 1895
(91 – 114)
3” (80)
750 - 1000
2840 – 3785
(170 – 227)
4” (100)
1250-2500
4730 – 9465
(284 – 568)
6” (150)
3000-4000
11355 – 15140
(681 – 908)
8” (200)
4100-5700
15520 - 21580
(930 - 1295)
10” (250)
1.1.2 The Bermad 43T Pressure-Relief Valves are rated to the maximum set pressure as followings:
• Class #150 / PN16: 4 – 15 bar (60 – 235 psi).
• Class #300 / PN25: 7 – 25 bar (100 – 365 psi).
Table 2: Operating Pressure Rating and Pilot Valve Setting Range:
Valve Size in mm)
3” (80)
4” (100)
6” (150)
8” (200)
10” (250)
Class #150 / PN16 bar (psi)
3-PB-16 pilot valve
set range: 4 – 15 (60 – 235)
3-UL-16 pilot valve
set range: 4 – 15 (60 – 235)
Class #300 / PN25 bar (psi)
3-PB-25 pilot valve
set range: 7 – 25 (100 – 365 psi)
3-UL-16 pilot valve
set range: 7 – 25 (100 – 365 psi)
