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Ball Valve Selection Guide

Views: 7     Author: Site Editor     Publish Time: 2022-12-09      Origin: Site

A ball valve is a shut-off valve that uses a rotary ball with a bore to control a liquid or gas flow. The rotary ball is rotated a quarter-turn (90°) around its axis to allow or block the flow through the valve. These valves are mostly preferred for their longer service life and reliable sealing property. There are many options available in the market when it comes to the selection of ball valves. However, the wide range of operation, connection type, circuit function, housing material, and many other criteria make the valve selection process complex. This article will walk you through the ball valve selection process.

Ball valve applicable range is very wide, ball valve can be applicable to:

1, nominal diameter from 8mm to 1200mm.

2, nominal pressure from the vacuum to 42MPa.

3, working temperature from - 204 ℃ ~ ℃ 815.


Ball Valve Selection Guide



Especially in petroleum, chemical, metallurgy, and other departments, in inflammable, explosive medium equipment and pipe system in use soft sealing ball valve, more should note refractory and fire prevention.


Usually, in double place regulating sealing performance strictly, mud, wear, shrink mouth channels, on-off movement.ball quickly (1/4 turn on-off), high voltage globe (differential pressure big), low noise, furious hole and gasification small leakage phenomenon, into the atmosphere, operating torque is little, fluid resistance small piping systems, recommend using ball valve.


Ball valve also applies to light structure, low voltage globe (differential pressure small), the corrosive fluids piping system.

In the low temperature (cryogenic) device and pipe system in also can choose ball valve.

In the requirement has regulation performance, needs to choose belt v-shaped openings of special structure ball valves.

In petroleum, petrochemical, chemical, electric power, city construction, the working temperature in 200 ℃ above piping systems can choose the metal to metal sealing ball valves.

In metallurgical industry oxygen pipe system in use to pass strict defatted processing ball valves.

In the pipeline and gas transmission pipeline to the competent line when buried in the underground, need to use full-bore welding type ball valve.

Ball valves in irrigation system is often applied, basically use in tubes inlet. Ball valve simple structure, small volume, the flow resistance is small, defect is opening or closing fast, can be in pipeline middle water hammer (pipe flow velocity in the pressure when suddenly changes will rise). So in ZhuGanGuan on unfavorable use ball valve, usable in in dry and tubes or its end be blunt washing with, washing drainage effect is good.

Ball valve selection for principles:


1, oil and gas transmission pipeline competent line, need cleaning, and for buried in the ground, the choice of sizes, full of welded structure ball valve, Buried in the ground, choose full-bore welding connection or flange connection ball, Tubes, choose flange connection, welding connection, whole given.it or shrink diameter ball valve.

2, oil conveying pipeline and storage equipment, selects flange connection ball valves.

3, city gas and gas pipelines, choose flange connection and threaded connections floating ball valve.

4, metallurgical oxygen pipeline system, appropriate chooses through strict defatted processing, flange connection of fixed ball valve.

5, low temperature medium piping systems and devices, appropriate chooses plus bonnet low-temperature ball valve.

6, refining installation of catalytic cracking unit of pipeline system, can choose lifting lever type ball valve.

7, chemical system soda acid corrosiveness device and pipeline system, appropriate chooses austenitic stainless steel manufacturing, ptfe for seat sealing the stainless steel ball valve.

8, metallurgical, power system, petrochemical plant, urban heating system of high temperature medium pipeline system or device, can choose the metal to metal sealing ball valves.

9, need to adjust the discharge, can choose worm gear and worm drive, pneumatic or electric with v-shaped openings of regulating ball valve.

Application Example One of the most common ball valve applications is for a residential water line. We walk through our selection process for this ball valve based on the steps outlined above.


Operation Type: We can select a manual ball valve as this application requires no automation and can be manually operated.

Circuit Function: We can choose a 2-way ball valve with a straight flow path in this case.

Housing Material: Brass housing is suitable due to the compatibility with water.

Sealing material: We should choose a PTFE seal due to its compatibility with drinking water.

Connection type size: We can choose a Standard/ Threaded ball valve for drinking water applications.

Flow Coefficient (Kv): We can calculate the Kv value by knowing the inlet pressure, outlet pressure, and the flow rate of the water in m3 inside the residence. However, for common applications like a residential water line it can often just be sized off the surrounding pipe size rather than the Kv value.

Pressure: A brass valve can withstand a maximum pressure of up to 80 bar, sufficient for our goals.

Temperature: The valve should be able to withstand a temperature range of -20°C to 60°C. Therefore, a brass valve is best.

Approvals: If used for drinking water, ensure the valve is approved for drinking water applications.




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