Honeywell D22-1/2A [2/5] Installation guidelines
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Honeywell D22-1/2A [2/5] Installation guidelines

Honeywell D22-1/2A [2/5] Installation guidelines
D22 - Pressure reducing valve with piston balanced seat
2 Product Specification Sheet • EN0H-1011GE23 R0916 • Subject to change
CONSTRUCTION
METHOD OF OPERATION
Spring loaded pressure reducing valves operate by means of
a force equalising system. The force of a diaphragm
operates against the force of an adjustment spring. If the
outlet pressure and therefore diaphragm force fall because
water is drawn, the then greater force of the spring causes
the valve to open. The outlet pressure then increases until
the forces between the diaphragm and the spring are equal
again.
The inlet pressure has no influence in either opening or
closing of the valve. Because of this, inlet pressure
fluctuation does not influence the outlet pressure, thus
providing inlet pressure balancing.
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 in horizontal pipework with spring bonnet
directed downwards
• Install shut-off valves
• The installation location should be protected against
frost and be easily accessible
– Pressure gauge can be read off easily (see
accessories)
– Simplified maintenance and cleaning
• Install downstream of the filter or strainer
– This position ensures optimum protection for the
pressure reducing valve against dirt
• Provide a straight section of pipework of at least five
times the nominal valve size after the pressure reducing
valve
• Requires regular maintenance in accordance with
EN 806-5
Overview Components Materials
1 Spring bonnet with
adjustment knob
High-quality synthetic
material
2 Housing Brass
3 Pressure gauge not included
(see accessories)
High-quality synthetic
material
Not depicted components:
Adjustment spring Spring steel
Piston guide Brass
Valve piston Brass
Diaphragm NBR
O-rings and seals NBR
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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