Honeywell DH300-200A [2/5] Construction
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Honeywell DH300-200A [2/5] Construction

Honeywell DH300-50A [2/5] Construction
DH300 - Pressure sustaining valve
2 Product Specification Sheet • EN0H-1331GE23 R0517 • Subject to change
CONSTRUCTION
METHOD OF OPERATION
If the supply is opened, water flows into the inlet section and
the rising pressure opens the valve so that water can flow
into the outlet section. Via the fine regulation valve
integrated in the pilot valve the inlet pressure increases the
pressure in the chamber above the diaphragm. The
diaphragm surface area subjected in this way to the inlet
pressure is somewhat greater than the surface area of the
valve plate which is also subjected to the same inlet
pressure, so the diaphragm valve closes.
If the inlet pressure exceeds the set pressure of the pilot
valve, the pilot valve opens up a link between the diaphragm
chamber and the outlet side. The pressure in the diaphragm
chamber reduces and the valve opens. If the inlet pressure
falls below the set opening pressure then the pilot valve
closes and the rising inlet pressure in chamber closes the
valve.
TRANSPORTATION AND STORAGE
Keep parts in their original packaging and unpack them
shortly before use.
The following parameters apply during transportation and
storage:
*non condensing
INSTALLATION GUIDELINES
Setup requirements
• Install shut-off valves
• Install downstream of the strainer
– Protects against damage from coarse particles
– Note flow direction (indicated by arrow)
• The installation location should be protected against
frost and be easily accessible
– Pressure gauge can be read off easily
– Simplified maintenance and cleaning
• Provide a straight section of pipework of at least five
times the nominal valve size after the pressure reducing
valve (in accordance with EN 806-2)
• Safety valve SV300 optional
• Requires regular maintenance in accordance with
EN 806-5
Overview Components Materials
1 Housing with flanges acc. to
ISO 7005-2 / EN 1092-2
Ductile iron (ISO 1083),
powder-coated
2 Pilot valve Brass
3 Control circuit with integral
rinsable filter insert and ball
valves on inlet and outlet
High-quality synthetic
material
Not depicted components
Cover plate Ductile iron (ISO 1083),
powder-coated
Diaphragm plate Ductile iron (ISO 1083),
powder-coated
Diaphragm EPDM
Spring Stainless steel
Regulating cone Stainless steel
Valve seat Stainless steel
Compression fittings Brass
Pilot valve housing Brass
Filter insert Stainless steel
Seals EPDM
Parameter Value
Environment: clean, dry and dust free
Min. ambient temperature: 5 °C
Max. ambient temperature: 55 °C
Min. ambient relative
humidity:
25 % *
Max. ambient relative
humidity
85 % *

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