SPX FLOW APV DELTA RG4 Instruction Manual page 12

APV
APV_RG4_ATEX_UK-0_032018.indd
positioner
integrated
B
A
7
5. Mode of Operation
5.1. General terms
Hygienic modulating valves DELTA RG4 are used for the
continuous control of liquid flows in beverage and food
technology as well as in the chemical and pharmaceutical
industry. Modulating valves are suited for the flow and
pressure control of liquids and gases.
D
The valves are designed for universal applications and stand out
for their increased mechanical reliability and absolute ease of
service.
- In its basic construction, the DELTA RG4 valve is designed as
corner valve and, thus, ensures a good diversion of liquid flows. The
flow direction is from A to B (see fig. 1).
- The body being free from dead spaces proves optimum cleaning
conditions. The crevice-free sealing of the individual parts of the
body is effected by profile seals, thus eliminating any source of
infection.
C
E
- The relation between flow and cone stroke is defined by the
characteristics.
- Different kvs values (flow) at certain nominal dimensions can be
reached by different inserts (valve seat / valve cone).
- The table (item 11) shows the parts which have to be replaced if
flow rates are changed. The design of the valves with regard to the
actuating pressure range or flow rate is made by the manufacturer.
- The connections for the electric and pneumatic supply lines are
located laterally at the valve positioner (E).
The pneumatic actuator (D) provides the path and the force to
open or to close the control element. The diaphragm actuator
is suited for longer actuating distances at minimum self-friction.
The valve positioner (C) guarantees the preset coordination
between valve position and control signal. It compares the control
signal (4-20 mA) given by the control device with the stroke of
the control element and defines the pneumatic actuating pressure
as output signal.
UK
Modulating Valve
DELTA RG4-ATEX
Instruction Manual: UK-0