DBB VALVE PDF

Committed to Quality. Committed to Customer Satisfaction. Our commitment to quality has allowed us to build strong relationships with customers. We design, manufacture and deliver innovative and high quality valves, which are used worldwide in critical applications. Our design and manufacturing process adheres to the most stringent quality standards of safety and efficiency, which has earned us the ISO certification. Our quality control process is designed to ensure that all our products meet the international standards.

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What is Double Block and Bleed Valves? Why use a Double Block and Bleed valve? Double Block and Bleed valves have evolved to replace the process of bolting together individual valves to provide dual isolation.

This new assembly provides great savings in weight, space and installation times especially in instrument or instrument cage isolation. However the greatest savings are to be seen in the reduction of leak paths to atmosphere, therefore reducing the risk of the potential hazards this entails. Dual isolation is a necessary requirement when maintenance is taking place down stream of the first isolation valve. Cavity venting is provided by either a ball or globe vent valve so that trapped pressure between the two isolation valves is safely vented These valves have also evolved to encompass the function of chemical injection using a suitable quill and sample points.

In-built check valves are often integrated in these valves. The purpose of the block and bleed manifold is to isolate or block the flow of fluid in the system, so the fluid from upstream of the manifold does not reach other components of the system that are downstream, then bleed off or vent the remaining fluid from the system on the downstream side of the manifold.

Five Types of valves 1. Block and Bleed A block and bleed manifold with one block valve and one bleed valve is also known as an isolation valve or block and bleed valve; a block and bleed manifold with multiple valves is also known as an isolation manifold. This valve is used in combustionable combustible gas trains in many industrial applications.

Block and bleed needle valves are used in hydraulic and pneumatic systems because the needle valve allows for precise flow regulation when there is low flow in a non-hazardous environment.

Double Block and Bleed DBB Valves These valves replace existing traditional techniques employed by pipeline engineers to generate a double block and bleed configuration in the pipeline.

Two block valves and a bleed valve are as a unit, or manifold, to be installed for positive isolation. Applications that use DBB valves include instrument drain, chemical injection connection, chemical seal isolation, and gauge isolation. DBB valves do the work of three separate valves 2 isolations and 1 drain and require less space and have less weight.

It features all the benefits of the single unit DBB valve, with the added benefit of a bespoke face-to-face dimension if required. Single Unit DBB This design also has operational advantages, there are significantly fewer potential leak paths within the double block and bleed section of the pipeline. Because the valves are full bore with an uninterrupted flow orifice they have got a negligible pressure drop across the unit. The pipelines where these valves are installed can also be pigged without any problems.

There are several advantages in using a Double Block and Bleed Valve. Significantly, because all the valve components are housed in a single unit, the space required for the installation is dramatically reduced thus freeing up room for other pieces of essential equipment. Considering the operations and procedures executed before an operator can intervene, the Double Block and Bleed manifold offers further advantages over the traditional hook up.

Due to the volume of the cavity between the two balls being so small, the operator is afforded the opportunity to evacuate this space efficiently thereby quickly establishing a safe working environment. Typical methods of providing positive energy isolation are blinds, disconnecting or misaligning piping, or DBB. There are specific categories of work where DBB is excluded from consideration as a viable method of positive energy isolation in certain jurisdictions, but most of the time it is acceptable.

Typically DBB is provided by shutting two block valves and opening a vent valve between them. The theory is that any leakage past the upstream valve will go up the vent instead of leaking through the downstream valve.

Several companies sell DBB valves that have two valves in a single valve body which includes a void space that has a vent valve on it. These valves work well for many situations, but they can be expensive, often introduce a measurable pressure drop, and are generally not piggable. Share With Your Friends.

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How It Works: Double Block-and-Bleed and Double Isolation-and-Bleed

IN Type - Maximum Pressure 6,psi 10,psi available as an option. Maximum Temperature C C available as an option. Heavy duty Firesafe versions are available. ID Type - Maximum Pressure 6,psi 10,psi available as an option. Comes with a Metal to metal seated needle valve and Soft seated ball valve. Ideal for double block and bleed for an instrument.

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What is Double Block and Bleed Valves ?

DBB Valves Double Block and Bleed Valves At Hy-Lok, we create value for our clients by engineering high quality double block bleed valves customized to match individual process requirements. Our compact, integrated designs and accurate, rugged construction provide a high reliability solution for complex multiple instrument valve systems. Able to tolerate temperatures from Our unique design approach achieves the highest level of seal integrity and optimal process compatibility. We create flexible configurations with a wide variety of end connections, body types, and valve technologies for critical piping applications including instrument isolation; pressure, level and flow measurement; instrument drain; chemical injection; and sampling. Constructed primarily from stainless steel, a variety of material options for ball seat, trim, stem, and end connector o-rings are available to accommodate specific process conditions. We manufacture our valves under the strict controls of our ISO and ASME certified quality assurance program to ensure process integrity.

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Welcome to YDB VALVES LLP

What is Double Block and Bleed Valves? Why use a Double Block and Bleed valve? Double Block and Bleed valves have evolved to replace the process of bolting together individual valves to provide dual isolation. This new assembly provides great savings in weight, space and installation times especially in instrument or instrument cage isolation. However the greatest savings are to be seen in the reduction of leak paths to atmosphere, therefore reducing the risk of the potential hazards this entails. Dual isolation is a necessary requirement when maintenance is taking place down stream of the first isolation valve. Cavity venting is provided by either a ball or globe vent valve so that trapped pressure between the two isolation valves is safely vented These valves have also evolved to encompass the function of chemical injection using a suitable quill and sample points.

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