PRESSURE REDUCING MODEL 129FC
Pressure Reducing Valve,An automatic, pilot controlled, pressure reducing valve, actuated by the pipeline pressure. The valve regulates to a steady, preset downstream pressure, regardless of upstream pressure or ﬂow rate ﬂuctuations. In case of excessive downstream pressure, the valve closes drip tight.
FEATURES & BENEFITS
Maintains constant discharge pressure regardless of upstream pressure or ﬂow rate ﬂuctuations
Easily cleaned, repaired & adjusted without removal the line
Easily adjusted for discharge pressures ranging 50-165psi
Applicable for water, seawater & foam
Out of box fully assembled & tested valves
Factory trimmed for vertical & horizontal installations without modiﬁcation
Extensive valve & trim materials selection and corrosion protection coating
CERTIFICATION & COMPLIANCE
• ANSI FCI 70-2 Class VI seat leakage class
• UL listed under VLMT category
Pump & Water Tanks
Fire Suppression Systems
Petrochemical, Oil & Gas Installations
Transformer & Transmission Plants
Onshore / Offshore
The normally open, spring loaded pilot, sensing downstream pressure, responds to changes in pressure and causes the main valve to do the same. The net result is a constant modulating action of the pilot and main valve to hold the downstream pressure constant.
The Model 129FC consists of the following components, arranged as shown on the schematic diagram:
 Model 65 Basic Control Valve, a hydraulically operated, diaphragm actuated, globe or angle valve which closes with an elastomer-on-metal seal.
 Model 1390 Pilot, a 3-way, normally-open pilot valve which senses downstream pressure under its diaphragm and balances it against an adjustable spring load. An increase in downstream pressure tends to make the pilot close.
 Model 159 Y-Strainer, protects the pilot system solid contaminants in the line fluid.
 Model 155 Visual Indicator Assembly, (optional) provides indication of the valve position at a glance.