<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Valve design</title>
</head>
<body style='font-family:Arial;'>
<p style="background:black;"><img src="Ventily_help_all.jpg"></p>

<h3>Valve design</h3>
<p>
The window is divided into three parts. The upper part shows “Tentative valve properties” (1) and “Actuator properties” (2) where the basic requirements for the valve are transferred from the calculation, or where they can be added manually. According to this option, a list of “Complying valves” (3) is shown in the left part of the window. By clicking on any of them, the appropriate series is selected, which makes the main part of the design accessible, where the user can specify the desired valve properties (4). Based on these properties, an order number (5) is generated at the bottom of the window. No data have to be entered at the top of the screen (1)(2).
</p>

<p>
It is recommended to proceed from top to bottom when selecting the valve properties (4). After selecting an item in the input field, the values in the fields shown below can be changed according to the production series.
</p>

<h4>
Check of Ppmax (maximum working pressure at a given temperature)
</h4>

<p>
Next to the PN combo box, there is information on maximum pressure (6) for the selected combination of PN, body material and temperature of the medium. The assumed temperature of the medium is a value from the top of “Medium temp.” box (7), which is taken over from the calculation, or entered directly by the user. If the temperature of the medium is not specified, the maximum working temperature of the valve is considered, which is selected in “Temperature” combo box (8).
If the calculation was made before the valve design, the entered working pressure from the calculation is checked against the maximum pressure of the valve Ppmax and if it is exceeded, the user is informed by an error message (6).
By clicking on the information about the maximum pressure (6) (next to the PN input field) a detailed list is displayed.
</p>

<p>
When specifying the valves of G series, the valve capacity is defined by Kvs value, like in the case of other products. Simple relations can be used for the conversion to the previously used value of flow area - Fs: <br><br>

- shaped plug (rounded inlet to the throttle section) <br>
Fs[cm2] = Kvs[m3/h] / 4.5 <br><br>
  
- perforated plug, plug with slots, piston plug (sharp edge at the input to the throttle section) <br>
Fs[cm2] = Kvs[m3/h] / 3 <br><br>
</p>

<h4>
Check of Kvmin
</h4>

<p>
Along with Kvs (maximum Kv) (9), there is the minimum value of Kv (10) defined for each valve. This means the minimum Kv value to be used for the medium flow control. Kvmin is displayed next to the input field of Kvs.
If the calculation with several states was made before the valve design, the calculated Kv value in any of the states may be lower than Kvmin of the selected valve. In this case, the valve cannot control the flow of the medium in this limit state properly. The programme will show an error message (10). By clicking on the information about Kvmin (10) (next to the Kvs input field) a detailed list is displayed.
</p>

<h4>
Calculation of the valve control force
</h4>

<p>
The valve control force has to be known to select the actuator. The pressure before and after the valve (11) has to be known for some types to determine it. If the calculation was made, these pressure values are determined from the calculation and the user can change them. Otherwise, these pressure values shall be entered. Clicking on the text “Pressure P1/P2” (11), an input field is shown, where both values are entered separated by “/” (e.g.: 2.1/1.5). Compliant actuators are filtered according to the calculated control force.
</p>

<h4>
Actuator design
</h4>

<p>
The actuator is selected in the next step. The input fields for the actuator selection are in the right part of the screen (12). 
</p>

<p>
<b>Note:</b><br>
<i>
The options of the “Actuator properties” in the top right corner (2) are used to select the series of valves that the actuator with the selected properties , can be used with. When these options are changed, a new selection of “Complying valves” will be carried out. These options are set before selecting a series of valves and detailed specification of the valve and actuator.
</i>
</p>

<h4>
The actuator can be selected in two ways
</h4>

<p>
<b>1.</b> If you require a specific type, select it in the “Type” list (13). You can reduce the range of types by selecting the “Producer”. After selecting the type, you can now specify additional features, such as control, power supply, force (14), etc. (for pneumatic actuators also control pressure, supply pressure, etc.), or if you know the order number of the actuator, you can select it in the list of order numbers (15) and the properties of the actuator will be entered automatically.
<br>
<b>2.</b> Select the properties (14), such as power supply, control, etc., but leave the “Type” input field (13) blank. After selecting the properties, the list of types is updated to suit the selected properties. Finally, select the type of actuator (13).
</p>

<p>
If the input field contains only one option, the program will select it automatically and highlight it in a bright colour.
</p>

<p>
In the right part of the window there is a red bar with the words “Parameters and description, scheme” (16). It is a part of the panel with additional information about the selected valve. When you click on it, it pops up, and when you click at the same place (vertical sign “Parameters and description, scheme”, it retracts again.
</p>

<img src='ventily_design_window.jpg' />
</body>