Fast and accurate control
The biggest single expenditure in a paper and board mill is on energy consumption. That is why faultless valve operation has an important role in the steam and condensate system. Metso offers a wide choice of on-off and control valves for the steam and condensate system. Good tightness is a preferred feature for all steam valves. If accurate control is your concern, the R-series segment valve is the obvious choice. It will help you to adjust temperatures in the steam and condensate system fast and accurately, for example in a grade change situation. Furthermore, our cost-effective triple eccentric butterfly valves offer excellent tightness and good control properties for steam and condensate systems.
Steam and condensate handling
Due to elevated temperatures metal seated valves are used in this process. The valves used should provide certain minimum tightness levels. The steam valves have to close as the paper sheet brakes or for other short shut down reasons. Elevated temperature in the dryers may damage the fabrics. The collection of condensate harms the re-start and causes problems to the machine drives.
If the paper machine is to produce only one bulk paper grade, no big adjustments of the steam flow have to be made. Here a butterfly type valve can be successfully used as the control element if the system design data is calculated solid.
The basis weight and the steam consumption of the board machines must be changed often in large increments during the operation. The valves used for control purposes must provide a good controllability (rangeability).
Learn more about basis weight control
Basis weight control is one of the most critical applications for a valve in a paper machine. Metso nelesACE is the ultimate offering for this application. The unit consists of a reliable V-port segment valve, complete with a high-resolution step-motor-driven rotary actuator, limit switches, and potentiometer. The nelesACE control unit's unique feature to run valve with various step sizes, depending on error between actual and desired flow rate, makes it a superior element for basis weight control.