Check Valve (Non-Return Valve): Types, and Pricing

 

Introduction

A check valve, also known as a non-return valve (NRV), is a mechanical device that allows fluid to flow in only one direction, preventing backflow. It is commonly used in pipelines, water supply systems, industrial processes, and pumps to maintain directional flow and prevent equipment damage due to reverse flow.

Check Valve Symbol

The check valve symbol used in engineering diagrams consists of a valve body with an arrow indicating the permitted flow direction and a barrier preventing reverse flow. It is commonly seen in process flow diagrams (PFDs) and piping and instrumentation diagrams (P&IDs).

Types of Check Valves (Non-Return Valves)

There are several types of check valves (NRVs) designed for specific applications:

  1. Swing Check Valve – Uses a hinged disc that swings open with forward flow and closes when the flow reverses.
  2. Dual Plate Check Valve – Features two spring-loaded plates that automatically open and close with the flow.
  3. Wafer Type Check Valve – A compact and lightweight design that fits between two pipeline flanges.
  4. Non-Return Check Valve – A general term for any valve that prevents backflow.
  5. Pilot-Operated Non-Return Valve – Uses external control pressure for precise flow regulation.
  6. PVC Check Valve – Made from polyvinyl chloride (PVC), suitable for water and chemical applications.
  7. Wafer Type NRV Valve – A wafer-thin non-return valve used for high-pressure applications.

Check Valve vs. Non-Return Valve

A check valve and a non-return valve (NRV) function similarly, as both prevent backflow. However, "NRV" is more commonly used in plumbing and water supply systems, while "check valve" is widely used in industrial applications.

Non-Return Valve Symbol

The non-return valve (NRV) symbol is the same as a check valve symbol, displaying a one-way flow path with a blocking mechanism to prevent reverse flow.

One-Way Valve Symbol

A one-way valve symbol is the same as a check valve symbol, indicating a unidirectional flow path.

Non-Return Valve Price

The price of non-return valves varies based on material, size, pressure rating, and manufacturer. Approximate price ranges:

  • PVC Non-Return Valve: ₹100 - ₹500
  • Brass Check Valve: ₹300 - ₹1,500
  • Stainless Steel NRV: ₹1,000 - ₹5,000
  • Industrial Dual Plate Check Valve: ₹2,000 - ₹10,000+

Frequently Asked Questions (FAQs)

1. What is the main function of a check valve?

A check valve prevents the reverse flow of fluids in a piping system, ensuring unidirectional movement.

2. Are a check valve and a non-return valve the same?

Yes, check valves and non-return valves serve the same function of preventing backflow, though their terminology varies based on industry usage.

3. Where are check valves used?

Check valves are commonly used in water supply systems, oil & gas pipelines, HVAC systems, and chemical processing industries.

4. What is the difference between a swing check valve and a dual plate check valve?

A swing check valve has a hinged disc that swings open and closed, whereas a dual plate check valve has two spring-loaded plates that move with the flow.

5. What factors affect the price of a non-return valve?

Material type, size, pressure rating, brand, and industry standards impact the price of a non-return valve.

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