News

What Is the Cracking Pressure of Check Valves?

Check valves are used in a wide range of industrial processes. While selecting the correct check valve design and materials for your application is important, it can be equally important to pay attention to what differential pressure is required to open the check valve.     Spring-loaded check valves have a spring that is activated by the pressures in the media, which open and close the valve. In spring-loaded check valves, the cracking pressure is determined by the spring setting and...

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DN2000 Expansion Joint Start Working for Ho Chi Minh Main Water Supply Line

On Apr.25th, 2023, workers are busy working to assemble the DN2000 bellow type expansion joint to the main water supply line in Ho Chi Minh City, Vietnam. Bosseal work with our partner in Vietnam to successfully deliver the goods within 40 days to the job site, for the urgent demand to replace the old valves from German which have served for more than 20 years.   It's an important job for the whole city as the government only agrees to do the replacement twice a year and 5 hours each time...

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How to Select between Gate Valves and Butterfly Valves

Gate valves and butterfly valves play the role of shutoff and regulating flow rate in pipeline use. Of course, there are methods in the selection process of a butterfly valve and gate valve, how to choose: gate valve and butterfly valve in the water supply network in order to reduce the depth of soil, generally large diameter pipe with butterfly valve, the impact on the depth of soil is not big, strive to choose the gate valve, but the price of the same specification of a gate valve is higher than...

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High Performance Butterfly Valve

A High-Performance Butterfly Valve(HPBV) can handle more critical services other than general water and air at a wider temperature and pressure range. Normally the Double Offset and Triple Offset butterfly valves can be used as High Performance, as they are more suitable for higher pressure, temperature and various fluid. Double Offset Butterfly Valve (Soft Seat) Triple Offset Butterfly Valve (Metal Seat) Compared with Concentric Butterfly Valves, they have unique design of offsets between shaft/disc/seat...

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Soft Seal Material Options for Ball Valves

This article is a general guideline for soft seal material selection for your unique applications, and customers are responsible for materials of construction being compatible with their valve application. Please consult Bosseal for details if you need further technical support.     PTFE (100% Polytetrafluoroethylene) Commonly referred to as DuPont’s Teflon®, PTFE is a thermoplastic fluoropolymer that consists of Carbon and Fluorine. This structure allows PTFE to be non-reactive...

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What is difference between DBB and DIB ball valves?

DBB-Double Block and Bleed Seat Design: Single Piston Seats on both sides The seats can be forced to the ball by pressure from upstream and downstream, but when the body cavity pressure is higher than the piping pressure, the seats will be pushed away from the ball and release the body cavity pressure. But it also means that, in case one side seat fails to work, the pressure will push the seat on another side away from the ball and cause leakage. The seats are in single-direction sealing. (The moving...

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Trim Numbers of Valves

For API valves, the trim is normally referred to the valve's internal parts that in contact with the fluid. According to API 600 and API 602, the trim is comprised of the following generally: a) stem; b) body seating surface; c) gate seating surface; d) bushing, or a deposited weld, for the backseat and stem hole guide; e) small internal parts that normally contact the service fluid, excluding the pin that is used to make a stem-to-gate connection (this pin shall be made of an austenitic stainless...

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