Honeywell R295SA Product specification sheet
Mechanical disconnector electrically actuated
GB type according to EN
Construction
The mechanical disconnectors comprises:
• Housing with pressure gauge
• Outlet check valve
• Electrically actuated changeover valve
• Pressure shock damper
• Threaded union connectors
• Discharge connection
• Spring bonnet
• Valve insert with spring
• Spindle guide with double O-ring seal
Materials
• Red bronze housing
• Brass union nuts
• Red bronze threaded union connectors (brass for 2")
• High quality synthetic material spring bonnet
• Brass changeover valve
• Stainless steel valve stem and spring
• High grade corrosion resistant synthetic material for other
EN0H-1207GE23 R0206 y Subject to change without notice
internal parts
• High quality synthetic material discharge connection
• High-quality synthetic material check valves
R295SA
1717/ type 2 according to DIN1988 part 4
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".
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 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
• Standardised discharge connection
• 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, 1.5 or 2.0 bar as required
Minimum inlet pressure
Electrical connection 230 V~/ 50 Hz
Connection size
40°C
= opening pressure + 1.0 bar
(special versions available on request)
1
/2“ - 2“
www.honeywell.com 33
R295SA 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 mechanical disconnector is hydraulically
changed over to the flow position. This occurs because the exposure of the upper part of the piston in the mechanical disconnector to atmospheric pressure is interrupted and the inlet
pressure is then applied to it. 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
R295SA-... A = With internal threaded union connectors,
0.5 bar opening pressure
R295SA-... B = With internal threaded union connectors,
1.0 bar opening pressure (standard pattern)
R295SA-... C = With internal threaded union connectors,
1.5 bar opening pressure
R295SA-... D = With internal threaded union connectors,
1.5 bar opening pressure
Connection size
Connection size R
1
/2"
3
/4"1"1
Weight approx. kg 1.4 1.6 1.8 4.3 4.9 5.3
Dimensions mm
L 151 153 159 216 228 241
l 105 105 105 150 160 165
H 160 162 162 232 231 224
h 125 123 123 158 159 166
T727272909090
3
Nominal flow rate m
/h
at ∆p = 0.8 bar 4.0 5.4 7.6 11.6 16.1 24.1
-value (full flow) 4.5 6 8 13 18 27
k
vs
ξ value 4 7 10 10 12.5 14
Opening pressure 0.5, 1.0, 1.5 or 2.0 bar as required
DIN/DVGW Approval No. NW - 6301 AT 2321
Special Versions available on request
1
/4"1
1
/2"2"
ZT295A
34 www.honeywell.com
5626200
M07M
Accessories
M07M Pressure gauge
Housing diameter 63 mm, rear connection thread
1
/4". Ranges: 0 - 4, 0 - 10, 0 - 16 or 0 - 25 bar. Plea-
G
se indicate upper value of pressure range when ordering
ZT295A Soldered union connectors (pack of 2)
Available for diameters from 15 - 54 mm
5626200 Pressure shock damper
1
Bottom connection, G
/4“
Diameter ∅ 85 mm
EN0H-1207GE23 R0206 y Subject to change without notice
Loading...