Globe valve class

Globe valves are also children of the Valve parent, as shown in the following code:

# valve.py (part 9)
1  class Globe(Valve): 
2      """Throttling valve.""" 
3 
4      def read_position(self): 
5          """Identify the position of the valve.""" 
6          return "{name} is {position}% open.".format(name=self.name, position=self.position) 
7 
8      def turn_handle(self, new_position): 
9          """Change the status of the valve.""" 
10          if new_position == 100: 
11              self.open() 
12          elif new_position == 0: 
13              self.close() 
14          else: 
15              self.position = new_position 
16              self.flow_out = self.flow_in * self.position / 100 
17              self.press_drop(self.flow_out) 
18              self.get_press_out(self.press_in) 

Globe valves can be any position from fully open to fully closed, so the Globe subclass is similar to the Gate subclass. The primary difference is in turn_handle(), which accepts any value from 0 to 100. If the valve isn't fully open or closed, then the pressure and flow parameters of the valve are automatically adjusted.