Mechanical disconnector electrically actuated
GB type according to EN
Construction
The mechanical disconnectors comprises:
• Housing with pressure gauge
• Outlet check valve
• PN 16 flanged connections to ISO 7005-2, DIN EN 1092-2
• Drain connector
• Spring bonnet
• Valve insert with spring
• Electrically actuated changeover valve
• Spindle guide with double O-ring seal
Materials
• Grey cast iron housing, powder coated inside and outside
• NBR seals
• Stainless steel valve stem and spring
• Brass changeover valve
• Red bronze drain connector up to DN 100, Grey cast iron
drain connector DN 125 - DN 200, powder coated inside and
outside
• Chrome plated balanced-seat piston
• Red bronze for other internal parts
EN0H-1213GE23 R0206 y Subject to change without notice
• High grade synthetic material bearing surfaces for sliding internal parts
1717/ type 2 according to DIN1988 part 4
R295SP-F
Product specification sheet
Application
Mechanical disconnectors of this type are suitable for the protection of drinking water systems as required by EN 1717 "The technical regulation of drinking water systems" and correspond to
DIN1988 part 4 type 2 construction.
Their purpose is to protect systems against back pressure, back
flow and back syphonage of non-potable water into the public
water supply network.
Mechanical disconnectors of this type can be used to provide
protection up to and including liquid category 4 (toxic, very toxic,
carcinogenic and radioactive substances).
The changeover from shutoff to flow positions can be by means
of an hydraulic or electrical/electronic actuator.
Special Features
• DIN/DVGW and SVGW approvals in all connection sizes
• Optimal protection of the drinking water supply system
• Enhanced protection against back pressure, back flow and
back syphonage into the water supply network
• Shutoff position visually indicated on the spring bonnet
• Compact construction
• Powder coated inside and outside - Powder used is physiologically and toxicologically safe
• Meets KTW recommendations for potable water
•Low pressure loss
Range of Application
Medium Cold water
Max. inlet pressure 16.0 bar
Technical Data
Installation position Horizontal with spring bonnet upwards
Max. operating
temperature
Opening pressure 0.5, 1.0 or 1.5 bar as required
Minimum inlet pressure
Electrical connection 230 V~ / 50 Hz
Connection size DN 65 - 200
40°C
(DN 65 - DN 100)
0.5, 1.0 bar as required
(DN 125 - DN 200)
= opening pressure + 1.0 bar
Special Versions available on request
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R295SP-F Mechanical disconnector electrically actuated
Method of Operation
When the electrically actuated changeover valve receives an
electrical signal, for example from a pressure or flow switch or
water level indicator, the disconnector is hydraulically changed
over to the flow position.
This occurs because the exposure of the upper part of the piston
in the backflow preventer to atmospheric pressure is interrupted
and the inlet pressure is then applied to it and this in turn pushes
the piston so that it moves to the flow position.
When the draw off stops, the signal operates the electronic actuator in the reverse direction. The upper side of the piston is then
depressurised and the spring pushes the piston back to the shutoff position.
Options
R295SP-... FA = With flanges, 0.5 bar opening pressure
R295SP-... FB = With flanges, 1.0 bar opening pressure
(standard version)
R295SP-... FC = With flanges, 1.5 bar opening pressure
Special Versions available on request
Connection size
Connection size DN 65 80 100 125 150 200
Weight approx. kg 49 68 90 146 207 409
Dimensions mm
L 532 572 652 752 882 1102
H 380 495 475 528 563 851
h 165 208 232 280 313 438
Nominal flow rate m
3
/h
at ∆p = 0.8 bar 45 55 112 186 245 324
kvs-value (full flow) 50 62 125 208 274 362
ξ value 111710 9 1019
Opening pressure (bar) 0.5, 1.0 or 1.5 bar as required 0.5 or 1.0 bar as required
DIN/DVGW Approval No. NW - 6301 AT 2324
SVGW Approval No. 8309-1381
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EN0H-1213GE23 R0206 y Subject to change without notice