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DOROT.S80.QR 2W 29-500.IOM.EN.1223
Installation, Operation & Maintenance
Control function QR
Quick pressure relief valve
1. Function description
An automatic, pilot controlled back-pressure sustaining/relief valve. The valve maintains a
steady, predetermined pressure in the network, upstream of its location. If the pressure falls
below the set-pressure, the valve closes drip tight.
2. Technical features
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Medium: Water; natural, non-aggressive fluids, other (contact Aquestia).
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Pressure-rating: 1½" - 4"R – 10 bar (145 psi).
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Temp. range: 2 – 60ᵒC (35 - 140ᵒF).
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Flow speed for continuous operation: 0.1 – 5.5 m/sec (0.3 – 18 ft/sec).
Maximal flow speed for intermittent operation: 8 m/sec (26 ft/sec).
Notes:
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If the designed/actual operating conditions on-site are incompatible with the definitions
above – please contact Aquestia application engineering.
-
Refer to the specific valve model publications for further details.
3. Safety guidelines
Before using this product:
-
Read and understand the instructions and save them for future reference.
Before disassembly of any accessory or component:
-
All internal pressures must be relieved, and all media drained from the system in
accordance with all applicable procedures.
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Pressure must be 0 (zero) bar/psi.
Please note:
-
Damage to the system/surroundings may occur if installation, commissioning, operation,
and maintenance instructions are not followed, or if applicable codes of practice and
regulations are ignored.
-
Electrical works (e.g., connection of solenoid-valves, limit-switches etc.) must be performed
by a certified electrician.
-
Errors in the layout design, installation or operation may affect the valve's performance and
risk the system and the operator/users.
-
The system's layout, installation, and commissioning are the responsibility of the system
designer, installer and/or user.
-
In any case of doubt and prior to taking any further action – please contact an Aquestia
representative for assistance.
Failure to follow the instructions set forth in this publication could result in property damage,
personal injury, or death from hazards that may be associated with this type of equipment.
Quick pressure relief (QR)
Applicable models:
80
Sizes: 1½
" - 4"R / 40 - 100mmR
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Summary of Contents for Aquestia DOROT QR
- Page 1 The system’s layout, installation, and commissioning are the responsibility of the system designer, installer and/or user. In any case of doubt and prior to taking any further action – please contact an Aquestia representative for assistance. Failure to follow the instructions set forth in this publication could result in property damage,...
- Page 2 It is highly recommended to install an upstream manual isolating valve [1], as shown in the drawing above. d. Flush the pipeline, upstream of the valve, before assembly of the control valve. e. Dorot valves are generally designed for use in freshwater systems. Please consult Aquestia application engineering if other media is to be used.
- Page 3 3 IOM DOROT QR 2W 29-500 5. Control-trim 6. Commissioning & adjustment a. Turn adjusting bolt of the pilot-valve clockwise completely. b. Start the pump or open the upstream isolation valve [1] (see section 4). c. Slowly turn adjusting bolt of the pilot-valve counter-clockwise, until the pilot’s vent starts dripping.
- Page 4 4 IOM DOROT QR 2W 29-500 Troubleshooting Issue Cause Check Solution Readjust the pilot set- Pilot incorrectly Verify upstream point (7-10 mwc above Valve fails to open adjusted. pressure. normal maximal pressure). Readjust the pilot set- point (7-10 mwc above...
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