Method for regulating a valve

1. A method for regulating a valve, comprising:

arranging the valve in a steam line of a bypass station wherein the steam line has a device for spraying water into the bypass station;

determining an actual volume of water {dot over (m)} W,IST , a desired volume of water {dot over (m)} W,SOLL and a maximum water-volume deficiency FBmax;

forming a quotient, t Rest,0 between the maximum water-volume deficiency FB max and the difference of the desired volume of water {dot over (m)} W,SOLL and the actual volume of water {dot over (m)} W,IST according to the equation;

t

Rest

,

0

=

FB

max

m

.

W

,

SOLL

-

m

.

W

,

IST

and

closing the valve when t Rest,0 is smaller than a value Δt

wherein the maximum water-volume deficiency FB max is formed from a multiplication between a maximum volume of spray water {dot over (m)} W,max and a maximum time without water spraying t max,0 according to the equation FB max ={dot over (m)} W,max ×t max,0 .

2. The method as claimed in claim 1 ,

wherein the value Δt is a cycle rate and the actual volume of water {dot over (m)} W,IST and the desired volume of water {dot over (m)} W,SOLL are determined according to each cycle rate Δt.

3. The method as claimed in claim 2 ,

wherein according to each cycle rate Δt, a residual time t Rest,i is determined and the valve closes when the residual time t Rest,i is less than the value Δt, and

wherein i represents a counting of a loop, starting at zero, according to which the residual time t Rest,i is calculated in each case.

4. The method as claimed in claim 3 ,

wherein the residual time t Rest,i is determined according to a loop according to the following formula:

t Rest,i =(( {dot over (m)} W,SOLL −{dot over (m)}{dot over (m)} W,IST ) i-1 ×t REST,i-1 −0.5×(( {dot over (m)} W,SOLL −{dot over (m)} W,SOLL −{dot over (m)} W,IST ) i )×Δ t )/( {dot over (m)} W,SOLL −{dot over (m)} W,IST ) i .

5. The method as claimed in claim 3 ,

wherein the residual time t Rest,i is determined according to the trapezoid rule.

6. The method as claimed in claim 1 ,

wherein the water which is sprayed into the steam line is provided for cooling steam which flows in the steam line.

7. The method as claimed in claim 1 ,

wherein the maximum deficiency FB max represents a deficient maximum volume of water which is sprayed into the steam line for cooling and is determined according to the following equation:

FB max ={dot over (m)} W,max ×t max,0 ,

wherein {dot over (m)} W,max represents a maximum volume of sprayed water and t max,0 represents a maximum time without water spraying.