Monitoring the Disc Position

  Enquiry / contact me

Direct evaluation at the shaft

Pumps, Valves & Compressors

Monitoring the Disc Position
Monitoring the Disc Position

In applications where aggressive or harmful media are used, the reliable function and monitoring of the valve position is key to safety. Especially in critical cases, actuators are therefore often oversized in order to guarantee a reliable function also with extreme operating conditions. However, this oversizing creates, especially with pneumatic actuators and higher pneumatic supply pressure, the risk of a drive torque that can be too high for the valve itself. In this case, the shaft of the valve can be twisted or even sheared off at the weakest point, the external end of the shaft, if the disc is blocked e.g. by solid parts or swollen liners. Also, high cycle rates with high torques or additional mounting brackets can result in an increased clearance between actuator and valve shaft.

Avoiding incorrect position signals

The normally used position indication of the valve by using the feedback of the end position of the actuator is in these critical applications not sufficient, as the position of the actuator is monitored but not the real position of the valve disc. This can result in fatal consequences during operation, as the disc of the valve might not be in final close position caused by above described reasons, although the actuator itself has reached his final position. A solution for that problem is a new development by InterApp, the inner shaft monitoring at the valve itself, like shown in the picture. Monitoring the position of the shaft in the valve itself allows to definitely detect the disc position, independently from the monitored position at the actuator. With that new system, in the case of a hazardous incident, a huge damage caused by an irregular feedback of the valve position can be effectively avoided.

Posted on October 5, 2018 - (1059 views)
InterApp AG
Grundstrasse 24
6343 Rotkreuz - Switzerland
View full company profile
Related articles
Small Electric Subsea Valve Actuator with Safety Spring
Suction Lance With Continuous Level Measurement
Precision Valves for Carbon Capture Technology
Coated Split Pumps
Smart Safety Valve for Technical Gases
Digital Product Pass for Valves and Manifolds
Control Valve with Motorized Actuator
Stainless-Steel Progressing Cavity Pumps
AC Powered Linear Actuator
Wireless Condition Monitoring System
Handle with... CO.RA.
handle with... CO.RA
Customized Pump Technology. For Life.
Precious Resource FOR LIFE
Handle with.... CO.RA
Always working when you need it
handle with... CO.RA.
Valves and Systems for the Pharmaceutical and Chemical System
Dbb Trunnion Ball Type Valve
Valves and Control Systems
Smart Safety Valve for Technical Gases
Dome Pressure Regulator with Integrated Digital Sensor Technology
Super High Response Speed Servo Valve
Liquid Filtration Solutions
Programmable Dispensing System PDS100
Programmable Dispensing System PDS100
Pinch Solenoid Valves
Hygienic Thermowells for Safe Processes
Pneumatic Stoppers
Canned Motor Pumps
Polymer Coating Solutions
Rotary Lobe Pump TORNADO T2
Valveless Metering Pumps and Dispensers CeramPump®
Valveless Ceramic Pumps
Solenoid Driven Metering Pump
Pumps & process equipment:
Low power solenoid valves
Progressing cavity pumps
The chemistry is right in Asia
Screw blowers