The BERMAD Model WW-900 is a unique product integrating both a Woltman-type water meter and a diaphragm actuated hydraulic control valve, both functions working simultaneously. A water meter, providing a full spectrum of metering functions, from simple visual readout, with pulse or analog 4 – 20 mA output for computerized data acquisition ideal for SCADA systems. A standalone hydraulic valve with a full range of control features; On/Off, pressure reducing, sustaining, flow and level control.
Line pressure is applied to the control chamber of the hydrometer through the opened 3-way solenoid or cock valve. This creates superior hydraulic force in the control chamber that causes the valve to close and seal drip tight.
Closing the Solenoid or cock valve, discharges the line pressure from the control chamber. This in turn causes the line pressure under the plug to open the valve, and measure the flow.
Includes: Vacuum-sealed meter register, magnetically coupled to the impeller drive, with robust brass cover. Hermetically sealed control head and register(s). High sensitivity, providing superior accuracy that meets most water meter standards. Available of Reed Switch and Opto-Electric pulse readers (4 - 20mA optional with converter).
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.
Various springs are available to meet different requirements.
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.
[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 mushroom-shaped flow.
[5.3] Impeller – Woltman-type impeller with tungsten carbide shaft tips and bearings for high, long-term accuracy and negligible wear.
[6.1] Seal Seat – Metal ring vulcanized with elastomeric seal, raised and distanced from valve body to prevent cavitation damage.
[6.2] Integral V-Port for smooth regulation and closing charateristics.
[6.3] Lower Flow Straightener – Straightens inlet flow, eliminating the need for straight upstream pipe required in standard water meters.
Enables recalibration instead of renovation when the recommended standard accuracy period has elapsed (The Calibration Device is closed with a seal).
Hydro-dynamically designed for efficient flow with minimal pressure loss and excellent resistance to cavitation. End Connections conform to pressure ratings and standards: ISO, ANSI, JIS, BS, and others.
 Control Head:
Copper, Brass Reinforced Nylon, and Glass
 Cover: Epoxy Coated Ductile Iron to EN 1563
 External Bolts / Nuts: Stainless Steel 316
 Internal Bolts, Nuts and Washers: Stainless Steel 304 and 316
 Spring: Stainless Steel 302
 Closure Assembly:
[6.1] Diaphragm: Synthetic Rubber
[6.2] Closure: Glass Reinforced Nylon
[6.3] V-Port: Stainless Steel 304
 Impeller Assembly:
[7.1] Guide: 2” Pa12, 3&4” PVDF, 6-10” 303 Stainless Steel
[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: Synthetic Rubber
[8.2] Impeller Housing and Lower Flow Straightener: Glass Fiber Reinforced Nylon
 Valve Body: Epoxy Coated Ductile Iron to EN 1563
O-Rings: Synthetic Rubber
Coating: Epoxy Fusion Bonded, Blue, 250 micron
DN40 - DN250 (1½” - 10”)
DN40 - DN50 (1½” - 2”) - Threaded
DN80 - DN250 (1½” - 10”) - Flanged
DN80 - DN150 (1½” - 6") - Grooved
Flanged: ISO 7005-2 (PN10 & 16, other standards available)
Threaded: Rp ISO 7/1 (BSP.P) or NPT
Pressure Rating: PN16
PN10: 0.7-10 bar
PN16: 0.7-16 bar
For lower pressure requirements, please contact us
Water up to 50°C
Reed-Switch: Switching voltage: 48 VAC/DC max
Switching current: 0.2A max
Switching power: 4W max
Opto-Electric: Supply voltage: 5-12 VDC
Output type: complementary
Output current: 200 mA
Analog Output: Supply Voltage 24VDC