BERMAD 42T Owner's manual

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Bermad Pressure-Reducing
Pilot-Operated Pressure-Control Valve
Model: 42T
Installation
Operation
Maintenance
Manual (IOM)
04.08.2019
REV 3B

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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 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. General
The BERMAD 42T is a pilot operated, diaphragm actuated straight through flow type with a low pressure-loss, pressure
reducing valve.
It is an automatic pressure control valve that reduces a higher inlet pressure to a lower constant outlet pressure regardless of
fluctuating flow-rates and/or varying inlet pressure.
2. Pressure and Flow Ratings
The Bermad 42T pressure-reducing control valves are rated for the following pressure and flow capacities detailed in table 1.
Table 1: Pressure and Flow Ratings
Valve Size in.
(mm)
1.5”
(40)
2
"
(50)
2.5
"
(65)
3”
(80)
4”
(100)
6”
(150)
8”
(200)
10”
(250)
12”
(300)
14"
(350)
16"
(400)
Max. Inlet pressure
bar (psi)
27.5 (400)
Note 3
27.5 (400)
Note 3
27.5 (400)
Note 3
25
(365)
25
(365)
25
(365)
25
(365)
25
(365)
21
(300)
21
(300)
21
(300)
Pressure setting range
bar (psi)
4 – 15
(60-220)
4 – 15
(60-220)
4 – 15
(60- 202 )
4 – 12
(60-175)
4 – 12
(60-175)
4 – 12
(60-175)
4 – 12
(60-175)
4 – 12
(60-175)
4 – 12
(60-175)
4 – 12
(60-175)
4 – 12
(60-175)
Kv fully open valve
(Cv)
68
(79)
80
(92)
105
(121)
190
(219)
345
(398)
790
(912)
1160
(1340)
1355
(1652)
2370
(2737)
2850
(3292)
3254
(3758)
Leq m (ft)
Note 1
2
(7)
4
(14)
9.4
(30.8)
7
(23)
9
(30)
15
(49)
27
(89)
62
(203)
52
(171)
59
(194)
88
(289)
Max. recommended
flow m³/h (gpm)
24
(106)
42
(187)
56
(247)
82
(360)
145
(640)
330
(1450)
580
(2570)
883
(3887)
1322
(5821)
1635
(7198)
2200
(9555)
Pilot Valve model 2PBL 2PBL 2PBL 2PBL 2PBL 2PBL 2PBL 2PBL 2-HC 2-HC 2-HC
Recommended Relief
valve size, inch (mm)
3/4"
(20)
3/4"
(20)
3/4"
(20)
3/4"
(20)
2"
(50)
3"
(80)
3"
(80)
4"
(100)
2 x 4"
(2x100)
2 x 4"
(2x100)
2 x 4"
(2x100)
Notes:
1) Valve Equivalent Length Value, for use in hydraulically calculated systems.
2) Consult Bermad for Maximum Recommended differential pressure, also refer to the 400Y cavitation Chart in Engineering Data
shows in www.bermad.com
3) UL-US only, ULC and FM certification pressure rating is limited to 25bar/365psi.
2.1 Head Loss
2.1.1 The minimum ΔP across the valve is 0.4 bar (5.8 psi). In cases where the inlet pressure falls below or is equal to the set
outlet pressure, the outlet pressure shall be determined according to the "Valve Outlet Pressure Fall-off Chart" in
Appendix A.
2.1.2 In the case of zero (static) flow, the maximum increase in the downstream (outlet) pressure above the pressure
setting of the valve, will not exceed 0.5 bar (7.2 psi).This is applicable only when an appropriate relief valve is
installed.
3. Approvals
The Bermad 42T pressure reducing valve 1.5, 2, 2.5, 3, 4, 6, 8, 10, 12, 14 and 16 inch sizes are UL Listed and FM Approved
when installed with specific system components as described in this installation manual. Consult Bermad for any
component approval recently to appear in any equipment directory.
A Listed Pressure Relief Valve must be supplied for installation with every pressure reducing valve, see table 1 for
Bermad recommended size.

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4. Installation
4.1 Allow enough room around the Bermad 42T pressure reducing valve assembly for any adjustments and future
maintenance/disassembly work.
4.2 Before the valve is installed, flush the pipeline to remove any dirt, scale, debris, etc. Failure to do this might result in the
valve being rendered inoperable.
4.3 UL-listed and FM approved indicating isolation valves should be installed upstream and downstream of the Bermad 42T
pressure-reducing valve to allow future maintenance, see fig. 1.
4.4 Using the lifting eye provided on the main valve cover for lifting and lowering the valve. Install the valve in the pipeline with
the valve flow arrow on the body casing in the proper direction.
Note: A small diameter bypass pressure-reducing valve may be required when large diameter pressure-reducing valve is used, to
accommodate low flow conditions such as those created by the flow of a hose connection or a single sprinkler.
4.5 The Bermad 42T pressure-reducing valve is suitable for horizontal or vertical installation. Ensure that the valve is positioned
so that the cover is facing upwards and can be easily removed for future maintenance.
4.6 After installation, carefully inspect/correct any damaged accessories, piping, tubing, or fittings.
4.7 A UL-listed and FM approved pressure relief valve with a proper size must be installed with every pressure control valve.
Note: The pressure relief valve shall be set to open at 0.5 – 1.0 bar (8 – 16 psi) above the 400Y pilot valve setting.
4.8 Install a listed pressure gauge on both the upstream & downstream of the Pressure Control Valve; see fig. 1 for indicated
installation.
4.9 Install the Bermad 42T pressure-reducing valve in accordance with the Standard for Installation of Fire Sprinkler Systems,
NFPA 13, or the Standard for Installation of Standpipe and Hose System, NFPA 14, as appropriate. The Bermad 42T pressure-
reducing valve is to be tested after installation in accordance with NFPA 13.
4.10 The Bermad 42T pressure-reducing valve is to be inspected, tested and maintained in accordance with the Standard for the
Inspection, Testing and Maintenance of Water-Based Fire Protection Systems, NFPA 25.
5. Factory Fitted Options
5.1 Valve Position Indicator (code I): This option provides the means for Visual indication of the Main Valve Position at all times
5.2 Valve Position Limit Switch (code S or S9): For Remote Indication of the Valve Position.
5.3 Large Control Filter (code F): Provides extra filtration capacity for the water supplied to the pilot system, it is recommended
for cases where there is any doubt as to the level of particulate matter in the water.
5.4 Valve Seat Ring (code T): Corrosion Resistant Seat Ring Inserted to the main valve.
5.5 Non Return Feature (code 20): Allows the valve to prevent return flow by adding check valves to the 42T pilot system, see
fig. 2B for operation principle and item 7 and 3B item 5 for specific arrangement.
5.6 Closing Speed Control (code 01): Allows valve
reaction speed adjustment, see fig. 2A / 2B item 3.
Figure 1B: Single Line Installation
Sprinkler System Pressure Reduction
 Reduces a high, unstable pressure supply to a preset,
stable system pressure
 Sets the sprinkler pressure to suit the system design
 For zonal pressure control
Hose System Pressure Reduction
 Reduces a high/unstable pressure supply to suit fire
hose pressure
 Limits fire hose pressure to 7 bar (100 psi) to meet
NFPA 14 regulations for maximum allowable hose
pressure supply
Two-Stage Pressure Reduction
 High pressure reduction ratio, when pressure
differential is more than 12 bar/175 psi
Redundancy Backup Pressure Reducing
 Backup valve inline to a master valve to secure pressure
rating at all times.
NFPA-14 requires that failure of a single device does not
allow pressure increase above the pressure rating

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Figure 1B: Parallel Installation
Bypass Backup Pressure Reducing Station
 High demanding system, parallel installation providing dual
redundancy and no downtime during maintenance or inspection.
Redundancy Backup Pressure Reduction
 Low flow bypass for large size valves, allowing the
larger size pressure reducing valve to open at high flow
demands only.
6. Operation
The pressure-regulating pilot senses downstream pressure and modulates the upper control chamber causing the main
valve to throttle, thus maintaining constant downstream pressure. When the downstream pressure falls below the pilot
setting, the pilot opens, pressure in the upper control chamber decreases, and the main valve modulates open to
increase downstream pressure and maintain pilot setting.
If the downstream pressure rises above the pilot setting, the pilot valve closes pressure in the upper chamber increases
and the main valve throttles close to decrease downstream pressure to the pilot setting.
The pressure-reducing pilot valve is equipped with an adjusting screw to preset the desired downstream pressure and
factory pre-set restrictor to control the closing speed.
6.1 Starting-up
When performing this procedure refer to fig. 2A / 2B.
6.1.1 Gradually open the upstream indicating isolation valve.
6.1.2 Open a hydrant, relief valve, drain valve, or other flow-consumer downstream of the Bermad 42T
Pressure-Reducing Valve, creating a system demand.
6.1.3 Gradually open downstream indicating isolation valve to fully open, allowing flow through the Bermad 42T
Pressure-Reducing Valve.
6.1.4 Wait for the downstream pressure to stabilize.
6.1.5 Slowly fully close the flow-consumer that was opened in step #1.
6.1.6 When there is no flow; the pressure on the downstream side of the system that is reflected through the
pressure gauge. Should be according to the factory pre-set adjusted pressure plus up to an additional 10%.
6.2 Readjusting
The pilot valve is usually factory pre-set according to the stated demands of the customer.
The pre-set is clearly indicated on the pilot valve tag. If readjustment to either the pressure or valve response is
required, follow the following steps.
6.2.1 When readjusting the outlet pressure, the inlet pressure should be at least 20 psi (1.4 bar) higher than the
set outlet pressure.
6.2.2 The flow rate during adjustment should be as close as is possible to the systems design flow rate. Where
this is not possible at least a minimal flow is essential.
6.2.3 Free the tension between the adjusting screw on the pressure reducing pilot valve (item 4, fig. 2A/2B) and
the fastening nut by turning the fastening nut counterclockwise.
6.2.4 By alternately turning the adjusting screw (5) on the pilot valve a half turn and then reading the
downstream pressure (6), gradually adjust the pressure:
6.2.5 Counterclockwise to decrease (-) the downstream pressure, or Clockwise to increase (+) the downstream
pressure.
6.2.6 Repeat the Starting-up procedure, steps 6.1.1-6.1.5.

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Figure 2A: Operation Drawing; 42T Pressure Reducing Valve
Figure 2B: Operation Drawing; 42T-20 Pressure Reducing valve with Non Return Feature
7. Maintenance and Inspection Test
Removing the System from Service
WARNING: Do not turn off the water supply to make repairs without placing a roving fire patrol in the area covered by the
system. The patrol should continue until the system is back in service.
Prior to turning off any valves or water supply, notify local site fire officials.
In any of the following inspections or testing procedures, if an abnormal condition exists, see Troubleshooting for possible
cause and corrective action.
The Bermad 42T Pressure-Reducing Valve is to be inspected, tested and maintained in accordance with the Standard for the
Inspection, Testing and Maintenance of Water-Based Fire Protection Systems, NFPA 25.
7.1 Normal Conditions
7.1.1 All main isolating valves should indicate a fully open position.
7.1.2 Upstream pressure gauge should (item 8, fig. 2) show the upstream pressure supplied to the valve.
7.1.3 Downstream pressure gauge (item 6, fig. 2) should show the downstream pressure according to the systems
designed requirement.
]8[
]8[

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7.2 Quarterly Inspection
7.2.1 The system should be checked for normal conditions.
7.2.2 Check that the main valve, pilot system, accessories, tubing & fittings, are all in good condition, damage free
and not leaking.
7.2.3 The fastening nut of the pilot valve (item 4, fig. 2) adjusting screw should be fastened tightly.
7.3 Annual Inspection and Test
7.3.1 Complete Quarterly Inspection.
7.3.2 Conduct a flow test with the systems nominal flow. The downstream pressure gauge should show downstream
pressure in accordance to the systems design requirement, this pressure should be stable.
If readjustment is needed it should be according to section 6.2.
7.4 Five-Years Inspection and Test
2.1.3 Complete Weekly and Monthly inspections.
2.1.4 Place the system out of service (See “Removing the System from Service” above).
2.1.5 The interior of the Control Valve should be cleaned and inspected.
2.1.6 The Elastomeric Diaphragm Assembly shall be inspected for wear, it is recommended to be replaced with a new
intact Diaphragm Assembly.
2.1.7 Place the system back in service. (See instructions "Starting–Up" section 6).
2.1.8 The valve and the pilot system must be activated at full flow.
2.1.9 Take all additional measures as required by NFPA-25 "Standard for the Inspection Testing and Maintenance of
Water-Based Fire Protection Systems.
7.5 Abnormal Conditions
CAUTION: Any maintenance or cleaning will cause the valve to open fully. Close upstream and downstream isolation
valves or omit the below activities or test if this may cause damage.
Symptom Probable Cause Remedy
Valve fails to
regulate
Restrictor (item 3, fig. 2) is blocked Clean and flush the restriction
Filter (item 2, fig. 2) blocked Remove filter cap and screen to clean
Air trapped in main valve cover
Loosen cover tube fitting at the highest point, bleed air and
re-tighten
Pilot valve is adjusted to wrong
value Readjust according to section 6.2
Valve fails to
open
Insufficient inlet pressure Check/create inlet pressure
No downstream demand Create demand/flow
Pilot valve is adjusted to low Readjust according to section 6.2
Isolation valves closed Open isolation valves
Valve fails to
seal properly Filter (item 2, fig. 2) blocked Remove the filter cap and screen to clean, see Note below
Debris trapped in main valve
Remove the valve cover and diaphragm, clean the seat
and
the valve interior from debris
Diaphragm in main valve is leaking
Remove the valve cover and Inspect the diaphragm and
replace if damaged
Note: In cases where the filter screen frequently becomes blocked, it is recommended replacing the standard filter with
Bermad Large Filter code “F” (see section 5.3).
7.6 Difficulty in Performance
Where difficulty in performance is experienced, the manufacturer or his authorized representative should be
contacted if any field adjustment is to be made.

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Figure 3A: Model 42T Pressure Reducing, General Arrangement
(GA) Drawing
Notes:
(1) Refers to the length dimensions for Raised Face ANSI #150, ISO 16 Flanged, Threaded and Grooved valves
(2) Refers to the length dimensions for Raised Face ANSI #300 and ISO 25 Flanged valves
(3) Exact dimensions for the trim envelope may vary with specific component positioning
(4) Pilot valve model #2PB/PBL for 1.5"-10", model #2HC for 12"-16" valve sizes
(5) Provide ample clearance for future maintenance

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Figure 3B: Model 42T Pressure Reducing with Non-Return Feature
GA Drawing
Notes:
(1) Refers to the length dimensions for Raised Face ANSI #150, ISO 16 Flanged, Threaded and Grooved valves
(2) Refers to the length dimensions for Raised Face ANSI #300 and ISO 25 Flanged valves
(3) Exact dimensions for the trim envelope may vary with specific component positioning
(4) Pilot valve model #2PB/PBL for 1.5"-10", model #2HC for 12"-16" valve sizes
(5) Provide ample clearance for future maintenance

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APPENDIX A: Fall-Off Charts
Bermad 42T Pressure Reducing Valve Outlet Pressure Verses Flow,
Should inlet pressure fall below to the valve outlet set pressure:
Bermad 42T, Size 1.5, 2 and 2.5"

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Bermad 42T, Size 12"
Bermad 42T, Size 1
6
"
Bermad 42T, Size 1
4
"

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