|Category:||Control Valves, 900 Series|
Threaded or Flanged
The BERMAD Model IR-900-M is a unique product integrating both a vertical turbine Woltman-type water meter and a diaphragm-actuated hydraulic control valve. The vertical turbine impeller drive is magnetically coupled to a vacuum-sealed meter register in the control head. Both the magnetic drive control head and its register(s) are hermetically sealed and are not affected by dirty water or environmental humidity.
The highly sensitive magnetic drive provides superior accuracy that exceeds all water meter standards. The available Reed Switch and Opto-Electric 4-20 mA transmitter options provide greater flexibility in electrical pulse generation. Serving as a Flow Meter and Main Valve, the BERMAD Model IR-900-M controls irrigation together with the irrigation controller.
The IR-900-M provides the full spectrum of metering functions – from simple visual readout, to pulse output for computerized data capture and control – while simultaneously allowing for numerous control valve features such as pressure, level, and flow control. Ranging in size from 11/2"; DN40 through 10"; DN250, the 900-M Series is specifically designed for metering and control applications in agricultural and landscape irrigation as well as in municipal & industrial water supply systems. The flow metering unit is vertical to the pipeline and includes an impeller with integrated inlet and outlet flow straighteners. This internal design eliminates the need for straightening distances, enables vertical or horizontal installation, and ensures accuracy even when the valve is partially open during pressure or flow control tasks. The impeller assembly shaft serves as the closure assembly guide, while also centralizing and tightening all internal parts both in their position and to one another.
The basic Model IR-900-M combines simple and reliable construction with superior performance, while at the same time being virtually free of the typical limitations associated with other single chambered valves. The relatively high impeller housing raises the location of the vulcanized seal seat above the valve body. This results in remarkable cavitation resistance and a smooth mushroom-shaped flow where the valve body is distanced from the flow. The closure assembly, combining a rugged radial disk harnessed to a flexible fiber-reinforced diaphragm, slides on the guide along the full valve travel. The diaphragm is carefully balanced and peripherally supported to avoid distortion, resulting in long-life and controlled actuation even under harsh conditions. One diaphragm and spring fully meet the valve's operating pressure range requirements. The cover is removable via fastening bolts for quick in-line inspection and service. All the internal assemblies can be easily removed from the valve body with no need for disassembling the valve from the line.
Features & Benefits
- Integrated “All-in-One” Control Valve
- Saves space, cost and maintenance
- Hydraulically Controlled Hydrometer
- Line pressure driven
- Magnetic Drive Register:
- Analog rotating hands display
- Water-free gear train mechanism
- Various pulse combinations
- Analog rotating hands display
- Internal Inlet & Outlet Flow Straighteners
- Saves on straightening distances of pipe
- Maintains accuracy
- Integrated Flow Metering Calibration Device
- Precise measurement
- User-Friendly Design
- Simple in-line inspection and service
- Computerized Irrigation Systems
- Irrigation Control Head
- In-Field Control Head
- Remote Flow Data Read-Out
- Flow Monitoring & Leakage Control
- Water Treatment Systems
- Volumetric Irrigation Systems
 Control Head
Includes: Vacuum-sealed meter register, magnetically coupled to the impeller drive. Hermetically sealed control head and its register(s). High sensitivity, providing superior accuracy that exceeds all water meter standards. Range of Reed Switch and Opto-Electric 4-20 mA transmitter options provide greater flexibility in electrical pulse generation.
 Valve Cover
Locates, centralizes, and fastens diaphragm, spring, and impeller assembly ensuring smooth and accurate performance. Simple and light construction enables quick in-line inspection and service.
 Auxiliary Closing Spring
One single spring fully meets valve requirements for operating pressure range, ensuring low opening pressure and secured closing.
 Closure Assembly
Combining a rugged radial disk harnessed to a flexible fiber-reinforced diaphragm. The fully guided closure assembly and the carefully balanced and peripherally supported diaphragm prevent distortion and protect the elastomer, resulting in long-life and controlled actuation even under harsh conditions. One diaphragm and spring fully meet the valve's operating pressure range requirements.
 Impeller Assembly
[5.1] Guide – Carries the transmission shaft, guides the closure assembly, and centralizes and tightens all internal parts.
[5.2] Upper Flow Straightener – Tightens the seal seat in place, straightens outlet flow and creates a mushroom-shaped flow.
[5.3] Impeller – Woltman-type impeller with tungsten carbide shaft tips and bearings for high, long-term accuracy and negligible wear.
 Impeller Housing
[6.1] Lower Flow Straightener – Straightens inlet flow, eliminating the need for straight upstream pipe required in standard water meters.
[6.2] Seal Seat – Metal ring vulcanized with an elastomeric seal, raised and remote from the valve body to prevent cavitation damage.
 Integrated Calibration Device
Enables recalibration instead of renovation when the recommended standard accuracy period has elapsed (The Calibration Device is stamped closed with a metal seal).
 Wide Body
Hydro-dynamically designed for efficient flow with minimal pressure loss and excellent resistance to cavitation.
[8.1] End Connections conform to pressure ratings and standards: ISO, ANSI, JIS, BS, and others.
On-Off Modes, Local Manual Control
Line pressure is applied to the control chamber of the hydrometer, through the override Cock-Valve. This creates a hydraulic force that moves the valve to the closed position and provides drip-tight sealing. Discharging pressure from the control chamber to the atmosphere causes the line pressure under the plug to open the hydrometer, measuring the flow rate.
On-Off Modes, Solenoid Controlled
Line pressure is applied to the control chamber of the hydrometer, through the opened 3-way solenoid. This creates a hydraulic force that moves the valve to the closed position and provides drip-tight sealing. Closing the Solenoid causes it to switch, discharging pressure from the control chamber. This in turn causes the line pressure under the plug to open the hydrometer, measuring the flow.
2-Way Modulating Modes, Pressure Reducing Pilot
Modulating to Close
The restrictor continuously allows line pressure into the control chamber, while the pilot controls outflow from the control chamber. Throttling when it senses a pressure rise, the pilot causes pressure to accumulate in the control chamber, forcing the valve to modulate closed
Modulating to Open
The pilot modulates open when it senses a pressure drop, releasing greater flow from the control chamber than the restrictor can allow in. This causes the accumulated pressure in the control chamber to drop, and the valve to modulate open.
Zero Flow Position
When demand drops to zero, downstream pressure begins to rise as the flow enters a closed line. The pilot closes, initiating the valve’s irreversible closing process, eventually causing it to seal drip tight.
3-Way Control Modes, Pressure Reducing
Fully Open Position
When upstream pressure drops, the pilot blocks the supply pressure port and opens the drain port, venting the control chamber to the atmosphere. This fully opens the hydrometer, minimizing head loss.
Modulating to Close
The pilot switches upon pressure rise, blocking the drain port and opening the supply pressure port. This pressurizes the control chamber, forcing the hydrometer to modulate closed.
When sensed pressure is equal to setting, the pilot blocks both the drain and the supply pressure ports. This locks the pressure in the control chamber, freezing the hydrometer opening in its last position until conditions change.
2/3-Way Modulating Modes, Flow Control
Modulating to Close
Should demand rise above the setting, the increasing flow dynamic-force moves the paddle, which thereby pushes up the pilot trim, causing a negative ratio between water flow into and out of the control chamber. Pressure then accumulates in the control chamber, forcing the hydrometer to throttle closed
Modulating to Open
When demand is below setting, the pilot's spring force pushes the pilot trim down, thereby causing a negative ratio between water flow into and out of the control chamber. Pressure is then released from the control chamber, enabling the hydrometer to modulate open.
As long as the flow is per the pilot setting, the pilot freezes the control chamber inlet and outlet flow ratio. This keeps the hydrometer opening rate constant, allowing the hydrometer to react "online" to any anticipated changes in supply and/or demand conditions
 Control Head: Plastic, Stainless Steel and Brass
 Cover: Polyester Coated Ductile Iron to EN 1563
 External Bolts / Nuts: Zinc-Cobalt Plated Steel
 Internal Bolts, Nuts and Washers: Stainless Steel 304 and 316
 Spring: Stainless Steel 302
 Closure Assembly:
[6.1] Diaphragm: Reinforced Natural Rubber (NR)
[6.2] Closure: Glass Fiber Reinforced Nylon
 Impeller Assembly:
[7.1] Guide: Stainless Steel 303
[7.2] Pivots, Bearings, and Thrust Bearings: Tungsten Carbide
[7.3] Upper Flow Straightener: Glass Fiber Reinforced Nylon
[7.4] Impeller: Polypropylene
 Impeller Housing Assembly:
[8.1] Seal Seat: NBR (Buna-N) Vulcanized Brass
[8.2] Impeller Housing and Lower Flow Straightener: Glass Fiber Reinforced Nylon
 Valve Body: Polyester Coated Ductile Iron to EN 1563 or Cast Iron
O-Rings: NBR (Buna-N)
Coating: Electrostatic Powder Polyester Green RAL 6017, 150 mμ
Available Patterns, Sizes & End Connections:
G = Globe, A = Angle 90°, H=Hydrant (Angle 120°) * Triangle Flange Inlet
Flanged: ISO 7005-2 (PN10 & 16)
Triangle Flange (DN65 inlet only)
Threaded: Rp ISO 7/1 (BSP.P) or NPT
Pressure Rating: PN16
Operating Pressure Ranges:
PN10: 0.5-10 bar
PN16: 0.5-16 bar
For Lower Pressure requirements, consult Deeco.
Temperature: Water up to 50°C
Pulse Electric Data:
Switching voltage: 48 VAC/DC max
Switching current: 0.2A max
Switching power: 4W max
Supply voltage: 5-12 VDC
Output type: complimentary
Output current: 200 mA
Dimensions and Weights
Valve flow coefficient, Kv or Cv Kv(Cv)=Q√Gr/ ∆P
Kv = Valve flow coefficient (flow in m3/h at 1bar Diff. Press.)
Cv = Valve flow coefficient (flow in gpm at Diff. Press. 1psi)
Q = Flow rate (m3/h ; gpm)
∆P = Differential pressure (bar ; psi)
Gf = Liquid specific gravity (Water = 1.0)
Kv = 0.865 Cv
Flow resistance or Head loss coefficient, K=∆H(2g/v²)
K = Flow resistance or Head loss coefficient (dimensionless)
∆H = Head loss (m ; feet)
V = Nominal size flow velocity (m/sec ; feet/sec.)
g = Acceleration of gravity (9.81 m/sec2 ; 32.18 feet/sec2)
Equivalent Pipe Length, Leq, Leq = Lk·D
Leq= Equivalent nominal pipe length (m; feet)
Lk = Equivalent length coefficient for turbulent flow in clean
commercial steel pipe (SCH 40)
D = Nominal pipe diameter (m; feet)
The Leq values given are for general consideration only.
Due to the wide range of options available and criteria for correct model selection, pricing and configuration are available on application only.
Please consult with Deeco engineers for more information.