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Non-return valve with large-sized outlet

A check valve, size technology, applied in the direction of control valve, valve device, functional valve type, etc., can solve difficult, impossible and other problems

Inactive Publication Date: 2006-12-06
RED VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that if the size of the mouth gap is greater than one-half the circumference of the ferrule diameter, it becomes difficult or even impossible to remove the integral mandrel used to make the check valve through the ferrule

Method used

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  • Non-return valve with large-sized outlet
  • Non-return valve with large-sized outlet
  • Non-return valve with large-sized outlet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] attached figure 1 and 2 A conventional duckbill check valve is shown. These valves include an inlet section 10 , a transition section 12 and an outlet section 14 . The advantage of this design is that machining costs are low and the mandrel can be easily removed from the entire part. attached figure 2 The check valve shown in is slightly widened, with the width of the outlet portion 14 approximately equal to half the circumference of the inlet portion 10 . It is slightly more difficult to remove the mandrel completely from the valve, but the head loss is low.

[0024] After extensive testing at the University of Utah Water Research Laboratory, for submerged outflow, the head loss of a "duckbill" check valve is very close to:

[0025] H=Q 2 / 19.5gA 2

[0026] where H = head loss in feet of water,

[0027] Q = the number of gallons of water flowing through it per minute,

[0028] g = gravitational constant = 32.16 ft / s 2 ,and

[0029] A = effective open area ...

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Abstract

The non-return valve has an upstream inlet part installed to the drainage end of pipeline, a downstream outlet part suitable for preventing liquid through the valve from returning, and a transitio part between the upstream part and the downstream outlet part, with the downstream outlet part size in the direction perpendicular to flow direction being at least 1.57 times that of upstream inlet part.

Description

technical field [0001] The present application relates to a check valve of the so-called "duckbill" type, which is used in drainage systems and sewage discharge lines. Background technique [0002] A check valve is essentially a valve that allows fluid to flow in one direction along a pipe, but closes and prevents backflow or reverse flow when the backpressure downstream of the valve increases to a level greater than the differential pressure of the upstream liquid. Check valves are used in many fluid transfer operations and must include some means of allowing forward flow of liquid while preventing any back flow. [0003] A conventional rubber duckbill check valve has an inlet nipple, an outlet mouth, and an intermediate transition connecting the nipple to the mouth. The mouth includes a slit that opens when fluid is forced through the valve. Typically, existing "duckbill" type check valves have a mouth gap that is equal to or less than half the circumference of the sleev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K15/14
CPCY10T137/7882F16K15/147Y10T137/7886Y10T137/7883
Inventor S·G·拉夫蒂斯A·T·阿布罗迈蒂斯M·J·杜尔
Owner RED VALVE
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