China Ball valve manufacturer,factory and supplier-Ball valve
 info@shxvalve.com

contact us

SHANGHAI HUIXUAN VALVE

Mobile:+86-17717520739
Wechat:17717520739
Email:info@shxvalve.com
Address: NO.720, Suide Road, Jiading District,Shanghai, China.
Ball valve manufacturer  

The difference between metal seat ball valve and soft seat ball valve

2021-01-08

When choosing the ball valve, you will face numerous choices. Available materials, proper size, and design are the key factors to decide which type of ball valve to use. Equally important is the type of ball valve seats which directly determines the leakage class of the ball valve. Before you choose the right ball valve seats, you must know the following question: Is the medium corrosive? Contains abrasive particles? For high temperature or high pressure? Once you know these things, you will make the right choice. Therefore, the first step to fully understand your craft condition: choose a suitable ball valve seat.

Almost all the industrial ball valves are metal seat and soft seat available. Both of them offers excellent sealing performance and have their unique and irreplaceable advantages, and inevitably, due to the shortcomings, costs, abrasion resistant performance, working conditions of different materials, metal-seated valves and soft-seated valves both have their markets and long-lasting solutions for critical applications.

The table below showed the advantages and disadvantages of metal seat ball valve and soft seat bal valve.

Metal seat ball valve VS soft seat ball valve:

Compare Metal seat Ball valve                 Soft seat ball valve
Material
Copper alloy (for low-pressure  valves);

Chrome stainless steel (for medium and high-pressure valves);

Satellite Seat Surface (High temperature and pressure valves and highly corrosive valves);

Nickel-based alloys (for corrosive media);

Metal-ceramic sealing material, etc

The elastic nonmetallic material such as PTFE(Temperature -50°F to 400°F);

modified PTFE( Temperature -50°F to 450°F);

Delrin(High pressure up to 5000psi dependant on valve size and temperature range of -50°F to 180°F);

Nylon(Temperature rating -30°F to 200°F;

PEEK(Temperature -70°F to 550°F);

Manufacturing  process

 

Need grinding, hardening and other precision processing. High precision requirements, complex processing and long production cycle Easy deformation, low processing accuracy, even free-processing
Medium

 

Hot water, gas, gas, oil, acid and alkali medium Air, water and other non-corrosive media
Working pressure Medium or high pressure above 3.5mpa Medium or low pressure
Working  temperature

 

Metal seat ball valve is suitable for temperature up to 540℃ (Higher based on the material of body and trim). Soft seat ball valve is suitable for the working temperature lower than 260℃. Aging easily affected by temperature, used in room temperature environment. Fire protection is needed to prevent leakage at high temperatures.
Leakage class(Ball valve) Class V and VI VI
Cost & Price Metal seat ball valve is much higher than soft seat valves Cheaper than metal seat valves
Sealing performance Wear resistance but easy to leak relatively poor sealing performance Easy to wear and can achieve a high level of sealing performance or even zero leakage


INQUIRY US

微信扫一扫

添加我为好友了解更多