Home > News > Industry news > Briefly describe the relationship between valve diameter and medium flow rate
News
company news
Exhibition news
Industry news
Certifications
Contact Us
Cowinns Industry Equipment Co.,Ltd
No.127 Room No.748 Changjiang Road,High-Tech District,
Suzhou City, Jiangsu Province, zip:215128 China
Tel:+86 512 6878 1993 
Fax:+86 512 6818 4193
Mob&what's app:+86 153 0620 9257 
Email:info@cowinns.com
www.cowinns.com
Contact Now
News

Introduction to PID Diagram Knowledge of Valve Industry

Introductionto PID Diagram Knowledgeof Valve Industry PID diagram is thetechnical core of factory production. Whether it is an engineer from a designi...

The difference between DBB, DIB-1, DIB-2

Two types of seat sealing structures commonto trunnion mounted ball valves. 1. Double block and bleed valve A valve with two valve seat sealing pairsc...

True Meaning of Double Block and Bleed

It’s time to do maintenance ona section of process. You don't want to shut down the entire facility, so youdecide to block off and depressurize just ...

The instruction of pneumatic actuators

First.Overview of pneumatic actuators Pneumaticactuators are actuators that use air pressure to drive opening and closing or controlvalve valves. They...

Check valve the most important valve in the process system

Checkvalve: the most important valve in the process system Mainfunctions and functions of check valve: Theyonly allow fluid to flow in one direction. ...

Equinor’s ambition in floating offshore wind

Equinor is planning to merge offshore wind and fossil energy exploitation with the Hywind Tampen project. The Norwegian company wants to further devel...

China (Shanghai) International Fluid Machinery Exhibition (2)

China (Shanghai)International Fluid Machinery Exhibition (2) The China(Shanghai) International Fluid Machinery Exhibition is one of the mostsignifican...

18''RF WCB Butterfly valve

Customized top connection dimensions 18'' RF WCB butterfly valve  supplied to power plant service for high temperature steam pipeline 

Introduction of suitable working temperature of valve body parts

Introduction of suitable workingtemperature of valve body parts 1. Overview One of the issues that must be consideredin valve design and material sele...

Gaskets Are Not Created Equal

Gaskets are near the bottom of the food chain of valve components; trim, body materials and packing seem to get a lot more press. But gaskets serve an...

News

Briefly describe the relationship between valve diameter and medium flow rate

COWINNS COWINNS 2022-10-18 17:40:29
Briefly describe the relationship between valve diameter and medium flow rate

The flow rate and flow rate of the valve mainly depend on the diameter of the valve, and are also related to the resistance of the structural type of the valve to the medium, and have a certain internal relationship with the pressure, temperature and concentration of the medium of the valve.

What exactly is the relationship between the two?

The flow channel area of the valve is directly related to the flow rate and flow, and the flow rate and flow rate are two interdependent quantities. When the flow rate is constant, the flow rate is large, and the flow channel area can be smaller; The smaller the flow rate, the flow channel area can be larger. Conversely, the flow channel area is large and its flow rate is small; The runner area is small and its flow rate is large.

The flow rate of the medium is large, the valve diameter can be smaller, but the resistance loss is large, and the valve is easily damaged. The flow rate is large, which will produce electrostatic effects on flammable and explosive media, causing danger; The flow rate is too small, inefficient, and uneconomical. For medium with high viscosity and explosiveness, a smaller flow rate should be taken. Oil and viscous liquids choose the flow rate according to the viscosity, generally 0.1~2m/s.                                                                         

     In general, the flow rate is known and the flow rate can be determined empirically. The nominal diameter of the valve can be calculated from the flow rate and flow rate.      

                              

The valve bore is the same, its structural type is different, and the resistance of the fluid is also different. Under the same conditions, the greater the resistance coefficient of the valve, the more the flow rate and flow rate of the fluid through the valve decrease; The smaller the resistance coefficient of the valve, the less the flow rate and flow rate of the fluid through the valve decreases.

Concentrate:

● The DN value is in mm

● The unit of P value is: MPa

●The resistance coefficient of the gate valve is small, only in the range of 0.1~1.5

●Large diameter gate valve such as pressure seal gate valve, the resistance coefficient is 0.2~0.5

●The resistance coefficient of the shrinking gate valve is larger

●The resistance coefficient of the globe valve is much larger than that of the gate valve, generally between 4~7. Y-type globe valve (direct flow type) has the smallest resistance coefficient, between 1.5~2

●Forged steel globe valve has the largest resistance coefficient, even as high as 8

●The resistance coefficient of the check valve depends on the structure: the swing check valve is usually about 0.8~2, of which the resistance coefficient of the multi-lobe swing check valve is large

●The lifting check valve has the largest resistance coefficient, up to 12

●The resistance coefficient of the plug valve is small, usually about 0.4~1.2

●The resistance coefficient of diaphragm valve is generally about 2.3

●The resistance coefficient of the butterfly valve is small, generally within 0.5

●The resistance coefficient of the ball valve is the smallest, generally about 0.1

The resistance coefficient of the above valve is the value of the valve in the fully open state