In the chemical industry K Controls
products are predominately used to accurately monitor or control the
position of on/off valves.
Sectors of the industry where the products
are used include refineries, organic and inorganic basic chemicals,
petrochemicals, petrochemical derivatives, solvents, polymers, resins,
dyes, pigments, paints, detergents, adhesives, agrochemicals and
synthetic fibres. Valve monitoring and control has to be accurate and
reliable in order to ensure consistent standards of product quality.
Plants are generally large and processes
are usually continuous. Hazards include corrosive materials, explosive
gasses and combustible dusts. On occasions plants can be located in
regions that experience high or low ambient temperatures.
For these reasons K controls products are
often supplied with Exi, Exed or Exd certification, to the very latest
standards, for use in hazardous gas and dust Zones 1,2, 21 and 22.
Valves can be located outdoors so
enclosures are rated IP66 or IP67. When there is a corrosive atmosphere
present enclosures can be supplied in stainless steel.
K Controls K4-20 position transmitters can
be used to monitor the performance of emergency shut-down (ESD) valves during partial stroke testing.
Solenoid valves are sometimes located in
remotely sited panels but this can lead to problems with valve
identification and lags in actuator response times. K Controls combines
one or more pilot solenoid valves for actuator control with the position
switches in the same compact enclosure local to each actuator. The
result is the 007C Control Monitor. Envelope dimensions of the 007C and
actuator assembly remain the same, the solenoid is protected from the
environment and if solenoid manual override is specified it is
“tamperproof” because it can only be accessed by deliberately removing
Exi switches can be mechanical or “Namur”
proximity, depending on the type of safety interface being used.
Solenoid function can be 3/2 single acting, 5/2 double acting or 5/2
double acting stay put. Low powered solenoid valves are available for
use with virtually all remote I/O systems or field bus valve couplers.
The K44 “Checktite” swing check valve is
widely used in the chemical industry. It has a very low cracking
pressure and pressure drop and is available with the same
range of end connections, seats and seals as three piece ball valves.
A reference list of K Controls chemical
industry clients is available on request.