---
title: Tools International - Dual Flapper Check Valves
description: Description, Specifications, Assembly, and Components for the Tools International Dual Flapper Check Valve.
image: https://www.tools-int.com/hubfs/Locking%20C%20Mandrel-Feb-20-2022-06-42-29-85-PM.png
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# DUAL FLAPPER CHECK VALVE

#### Tools International Corp

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#### Description

#### Specifications

#### Assembly

#### Components

### Description

 

The Dual Flapper Check Valve is a device used to prevent pressure or fluid from passing up through the  
assembly. It is used in conjunction with a “TICX” or “TICR” Locking Mandrel.

The Dual Flapper Check  
Valve has two flapper assemblies with seals to prevent pressure of fluid bypass upwards.  
The Dual Flapper Check Valve is a back pressure valve that allows the operator to pump through the assembly while allowing maximum flow through the assembly with minimal restriction.

Equalization can be achieved by placing an equalizing sub above the assembly, or by running a prong  
attached to the pulling tool that will knock both flappers off seat..

![DUAL FLAPPER CHECK VALVE](https://www.tools-int.com/hubfs/DUAL%20FLAPPER%20CHECK%20VALVE.jfif)

 

###          Specifications

 

| SPECIFICATIONS |  |  |  |
| --- | --- | --- | --- |
|  | **1 1/2"** | **2"** | **2 1/2"** |
| Max. O.D. | 1.328" | 1.750" | 2.156" |
| O-RING (2) | #116 | #122 | #128 |
| O-RING (2) | #116 | #215 | #221 |
| TOP CONNECTION | 1 1/8"-16 | 1 3/8"-14 | 1 3/4"-12 |
| BOTTOM CONNECTION | 3/8" NPT | 1/2" NPT | 3/4" NPT |
| FLOW AREA (SQ. IN.) | .208" | .374" | .785" |

###          Assembly

 

| ASSEMBLY |  |  |  |
| --- | --- | --- | --- |
|  | **1 1/2"** | **2"** | **2 1/2"** |
| Part Number | 21DUAL150 | 21DUAL187 | 21DUAL231 |

###          Components

 

| COMPONENTS |  |  |  |
| --- | --- | --- | --- |
|  | **1 1/2"** | **2"** | **2 1/2"** |
| Top Sub | 21DUAL005 | 21DUAL001 | 21DUAL011 |
| Bottom Sub | 21DUAL006 | 21DUAL002 | 21DUAL012 |
| Major Redress Kit | 21DUAL007 | 21DUAL003 | 21DUAL013 |
| Redress Kit | 21DUAL008 | 21DUAL004 | 21DUAL014 |
| Teflon Seat (optional) | 21DUAL015-TEF | 21DUAL020-TEF | 21DUAL025-TEF |

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