Block Valve

A Block Valve is a complex multi-port valve assembly that contains multiple internal control modules and static flow paths within a single P&ID symbol. Unlike a regular Engineering Item which has a simple open/close state, a block valve has an internal flow graph that determines how fluid travels through it based on the states of its constituent valves.

Key difference: A regular valve is a single controllable component. A block valve is a composite — it contains multiple valves, static geometries, and internal connections defined through the Symbol Editor.

🤔 When to Use Block Valves

Block valves are used when a single P&ID symbol represents a physical assembly containing:

• Multiple internal valves — each with its own actuator and state

• Static flow paths — internal piping that always allows flow

• Multiple ports — more than two connection points to the piping network

• Internal flow routing — fluid can take different paths depending on which internal valves are open or closed

Common examples: Multi-port divert valves, mix-proof valve assemblies, sampling valves with bypass, manifold blocks with multiple switching positions.

💊 Pharma example: A multi-port divert valve at the junction of a product line and a CIP return line. During production, the valve routes product to the filling line. During CIP, it diverts flow to the CIP return header. Each internal seat has its own actuator and state, and the Symbol Editor defines the internal flow paths between the ports.

🛠️ Setting Up a Block Valve

Step 1 — Classify as Block Valve

Before a block valve can be configured, its class must be set to the Block Valve type in the P&ID Components Classification system:

Once classified, reopen the drawing so AseptSoft recognizes the block valve.

Step 2 — Open Block Valve Styles

Navigate to the Module Ribbon → Data & Design drop-down → Block Valve Styles.

AseptSoft will scan the drawing for all engineering items classified as "Block Valve" and open the Symbol Editor for configuration.

Step 3 — Configure in the Symbol Editor

The Symbol Editor opens showing the block valve's internal geometry. You must define:

🔵 End-Connections (Ports)

If all end-connections are properly set up in the AutoCAD block definition, AseptSoft will automatically detect them and display them as green bullseye markers. These represent the external ports where pipes connect to the block valve.

⚙️ Control Modules (Internal Valves)

For every internal valve that has its own actuator:

1. Click Add Control Module (top left of the Symbol Editor)

2. Click Select Node to enter selection mode

3. Click on the line geometries that make up this internal valve's flow path

4. Hold Ctrl or Shift to select multiple lines in one session

5. Set the Type to "Valve" — this tells AseptSoft to follow State definitions for valves

6. Set the Class — this tells AseptSoft which class this internal valve belongs to, so it can receive the correct states

📐 Static Geometry Groups

For every internal path where fluid always flows (not controlled by any valve):

1. Click Add Static Geometry

2. Select the line geometries belonging to this static path

🔄 Flow Edges

Once all nodes (control modules and static geometries) are defined:

1. Click Add Edge to define a flow path

2. Each edge represents a connection between two nodes through which fluid can travel during Fluidstream Simulations

🏷️ Tag Configuration

Block valves can contain multiple internal valves, each needing its own tag for Export. During export, block valves can be split to show individual internal valves and their states separately.

For each control module, you can configure the tag in two ways:

♻️ Design Reuse

The Symbol Editor configuration is saved per block valve design (per unique block definition / class). This means:

• You configure each design once

• All future copies of the same block definition in the same Environment are automatically recognized and configured

• If you insert a new block valve of an already-configured design, it immediately works with the existing flow graph definition

🌊 Block Valves in Fluidstream Simulations

During Fluidstream Simulations, the simulation engine evaluates each block valve's internal graph:

1. Fluid arrives at one of the block valve's external ports

2. The engine checks the states of each internal control module (valve)

3. Based on which internal valves are open/closed, the fluid follows the defined edges through the internal graph

4. Fluid exits through the appropriate port(s) and continues along the piping network

The Symbol Editor page explains the internal flow graph model in detail, including how control modules, static geometries, and edges define the flow behavior.

💊 Pharma Scenario: Multi-Port Divert Valve in a Product/CIP Changeover

Consider a mix-proof block valve BV-201 with three ports: Product In, Product Out (to filling), and CIP Return (to CIP skid):

Each internal valve (A and B) has its own state in each step, and the block valve's internal flow graph routes fluid accordingly.

📊 Block Valves in the Valve Phase Matrix

Block valves appear in the Valve Phase Matrix with their internal control modules shown as separate rows. Each internal valve can have its own state per step, providing a detailed view of the block valve's behavior across all process steps.

🔗 Related Pages

• Symbol Editor — Configure the internal flow graph of block valves

• Engineering Item — Regular (non-composite) controllable components

• Connectors — End connections and blocked pairs

• State — State definitions used by internal control modules

• Fluidstream Simulations — How fluid flows through block valves

• Valve Phase Matrix — Matrix view showing block valve states across steps

• Module Ribbon — Access Block Valve Styles from the Data & Design panel

• P&ID Components Classification — How components are classified as Block Valves

• Export / Import — Block valve tag splitting during export