Dorot S100 User manual

Dorot Management Control Valves Ltd • Dorot, M.P. Hof Ashkelon 7917500 Israel
Tel. [phone] • Fax: [phone] • E-mail: in[email protected]m • www.dorot.com
Date: 02/07/2019
Water Level Control [FLDI1]
Pilot- 70550 and Pilot 31-10F
Applicable models: Sizes:
100,300,500 1½” - 8” \ 40-200mm
1. Function Description
An automatic, float-pilot water level control valve.
The valve will modulate to maintain a steady, predetermined level in the reservoir and will keep a drip-
tight close position in case the level is higher than the float-pilot location.
2. Technical Features
-Media: Water; Natural, non-aggressive fluids
-Pressure-rating PN16 or PN25 (250psi or 360 psi) per the specific valve-model
-Temp. range:
S300/100: 2 –80ᵒC (35 - 176ᵒF)
S500: 2 –60ᵒC (35 - 140ᵒF)
-Flow speed for continuous operation: 0.05 –5.5 m/sec (0.3 –18 ft/sec)
Max. flow speed for intermittent operation: 8 m/sec (26 ft/sec)
Notes:
-In case the designed\actual operating conditions are not suited with the above defined standard-
features –please contact the Dorot Applications-Engineering.
-Refer to the specific valve-model publications for further details
3. Safety Guidelines
-Injury or damage to the system\surrounding may occur if installation, commissioning, operation and
maintenance instructions are not followed or if applicable codes of practice and regulations are
ignored.
-The Dorot valves are designed for use in fresh water-systems. Please consult the Dorot Applications-
Engineering in case other media is to be used
-Be sure to de-pressurize the valve, prior to any disassembly of valve or control-trim parts.
-Electrical works (e.g. connection of solenoid-valves, limit-switches etc.) must be executed by
certified electrician.
-Errors in the layout-design, installation or operation may affect the valve's performance and may risk
the system and the operator\users. Please note the system's layout, installation and commissioning
of valves is the responsibility of the system's designer, installer and/or user.
-In any case of doubt and prior to taking any further action –please contact the Dorot representative
for assistance.

Dorot Management Control Valves Ltd • Dorot, M.P. Hof Ashkelon 7917500 Israel
Tel. [phone] • Fax: [phone] • E-mail: in[email protected]m • www.dorot.com
Date: 02/07/2019
4. Installation
a. The valve can be installed in any position though installation with the bonnet facing up is
recommended for ease of maintenance.
b. Flow direction should match the engraved arrow on the bonnet.
c. Flush pipeline, upstream the valve, before assembly of the control-valve.
d. Two ways to install the system:
e. Fig. 1- The valve is located above the water level. The pilot is attached to the valve by a bracket. It is
advisable to throttle the pipe’s outlet when installation is above the water level, to reduce noise and
increase the flow rate.
f. Fig. 2- Separate installation of valve and pilot. The pilot is connected to the tank wall or a suspension
rod (not supplied).
ions:ConnectFloat pilot
The pilot body has four ports,
(ent),V(ressure),Pmarked
(ottom).B(op) andT
Port Pconnected to upstream of
the main valve
Port Tconnected to Pilot 3110F port 1
Port Bconnected to Pilot 3110F port 5
Port Vopen to the atmosphere
Assembly instructions:
1.Drill 10mm bore in the tank wall. Take care
that the spacing will match the distance of
the pilot`s suspension plate.
2.Insert rivets [A]
3.Assemble brackets [B] using bolts [C]
4.Connect the Suspension plate of the pilot to
the brackets by bolts [D] and lock by the nuts.
Fig 1 Fig 2
Max
Min
P
T
Max
Min

Dorot Management Control Valves Ltd • Dorot, M.P. Hof Ashkelon 7917500 Israel
Tel. [phone] • Fax: [phone] • E-mail: in[email protected]m • www.dorot.com
Date: 02/07/2019
5. Control-Trim design
35m x ⅜"
⅜"
½”
⅜"
a
b
8"
d
f
35m x ⅜"
35m x ⅜"
c
e
⅜"
Main Parts
a. 70-550 Differential Float
pilot
b. Control circuit isolating valve
c. Self flushing inline filter
d. 31-10F Differential pilot
e. Selector valve
f. Orifice plate (optional).
6. Commissioning & Adjustment
a. Close the valve by closing the water source.
b. Connect the pilot to the water tank.
c. The pilot should be connected to the tank at the water height required.
d. Connect the pilot to the 3W ball-valve, using the ⅜" tube
•Note- On the pilot valve, the T-connector and the selector valve has green and red marked to right
connection of tubes.
e. Switch selector valve in to A (Auto) position
f. Open the water to fill the tank.
Charging the downstream system must be slow so to prevent pressure-surges

Dorot Management Control Valves Ltd • Dorot, M.P. Hof Ashkelon 7917500 Israel
Tel. [phone] • Fax: [phone] • E-mail: in[email protected]m • www.dorot.com
Date: 02/07/2019
Air-bleed in S-300/500 valves
This should be done with the control-chamber pressurized (main-
valve closed)
Using the supplied Allen key –open the air-bleed-screw at the top of
the bonnet and re-close it when only water and no air is discharged
(refer to the drawing on the right).
In case an indicator-rod exist –using hand force only –release and
tighten the round nut at the top of the indicator-guide.
7. Manual Activation
Note that
The valve can be opened or closed manually by operating the
selector valve.
Turn the handle toward port “Open” or “close” respectively.
OPEN
CLOSE
AUTO
AUTO
Fixed position
Return the valves [d] to “open” position after maintenance is completed.
8. Maintenance
g. Inspect and clean the in-line filter [c] as water quality dictates. This service should be cleaned once in a
few months.
During this operation, the main valve must be isolated from external pressures by closure of up- stream
isolating valve [b].
h. Inspect valve performance by checking water level in the tank periodically.
Extraction of screen element, filter
Valve
body Filtration
element
1
2
With Indicator
1
2
No Indicator

Dorot Management Control Valves Ltd • Dorot, M.P. Hof Ashkelon 7917500 Israel
Tel. [phone] • Fax: [phone] • E-mail: in[email protected]m • www.dorot.com
Date: 02/07/2019
9. Troubleshooting
Genearl check list
Ball valves [b]
All must be opened when operated
Scheme
Verify that the tubing is consistent with
the scheme
Release air trapped in the control
chamber (S300 only)
Filter
Check and clean
Valve fails to open
Valve [b] is closed
Open [b]
Pilot is stuck on close position
Check the mobility of the float –if
float isn’t mobile replace pilot
Check connection of the weight to the
pilot
Water running out of the
overflow tube
Verify that pilot is assembled beneath
the overflow tube (note that you can
add an extension for this purpose)
Connection of the control tube-
incorrectly
Verify that the tubes are connected
according to the green/red ringes
Valve fails to close
Verify that Diaphragm is not
leaking
Replace diaphragm if needed
Detect for clogged ports or
fittings