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Emerson Daniel 700 Series User Manual

Emerson Daniel 700 Series
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Technical Guide
DAN-LIQ-TG-44-rev0813
November 2013
28
Model 754 Rate of Flow Control (N.O.)
Closes on increasing differential pressure
A rate of flow or flow limiting valve is normally open and throttles toward a closed position on increasing differential pressure (P4
minus P1). It is a regulating or positioning type valve that does not require any outside power source to operate.
The pilot control is normally open. It is an adjustable spring loaded variable orifice in the Z-port. The pilot is piston operated,
spring biased (loaded) with a differential pressure sensing chamber connected to two separate pressure sources.
Rate of flow valves are used for:
1. Limiting the maximum flow through meters.
2. Limiting the maximum flow through pumps, process streams, etc.
Note: Minimum of 5 psid required for Control
= Inlet Pressure
= Outlet Pressure
= Product Pressure
FULL OPEN - NO CONTROL - The pilot is full open. Differential pressure (P4 minus P1) is less than
the pilot spring setting. Y-port (P3) is open to Z-port (P2). The valve is floating the stream and is
not required to control.
X
Z
Y
X
Z
Y
P3
P2
P4
P1
Flow Meter
Sense Line (Hi)
Sense Line (Lo)
Needle Valve/Strainer
(Closing/Sensitivity Control)
Differential
Pilot (N.O.)
Figure 4-20

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Emerson Daniel 700 Series Specifications

General IconGeneral
ManufacturerEmerson
CategoryControl Unit
Communication ProtocolModbus
Operating Temperature-40°C to +85°C
Storage Temperature Range-40°C to +85°C
Relative Humidity5% to 95% non-condensing
Communication PortsEthernet

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