CONTROL VALVES
Performance, Design & Service
The " PHOENIX MFC " valve is ideal for industrial, mining, municipal, irrigation and fire protection applications as no shafts, seals or guiding bearings exist in the valve which could be corroded or eroded by dirty, abrasive or chemically contaminated media. The valve can be installed in any position enabling its utilisation in various applications.
The valve can be controlled by the line media pressure, or if this is unsuitable, by an external separate hydraulic or pneumatic pressure source equal to or greater than the line pressure. The controlled media would then only contact the internals of the valve body and the bottom surface of the diaphragm.
The normal capacity of the Floval " PHOENIX MFC " valve is expressed at a pipeline velocity of 6.1m/sec, but during intermittent surges this velocity can be exceeded for a very short period of relief only. The following figures are maximum flow rates to be used as a guide for valve sizing:
HEAD LOSS CHART
CONSTRUCTION
A stable throttling position is obtained when a volume of pressure is retained in the upper chamber. It is this volume in the upper control that determines the position of the diaphragm. This control volume can be filled or exhausted to achieve the desired operating conditions
PRESSURE/
TEMPERATURE CHART
The capacity of hydraulic control valves can be expresed as the volumetric flow through the valve in the wide open position, without the restriction of pressure drops through the pilot and tubing system, at a velocity compatible with the pipeline.
In all cases when sizing hydraulic control valves the following must be considered:
1. Maximum flow at minimum head loss.
2. Minimum flow at maximum head loss.
The ratio of 1 and 2 is known as the turn down ratio and care should be taken that these figures are within the normal capacity of valves recommended ratio of 3:1. Where the turn down ratio is larger it is recommended to use a smaller control valve in parallel with the main valve to take care of low demand conditions.
MATERIALS, DIMENSIONS & WEIGHTS
MODEL DESIGNATION
