Block and bleed and mono flange valve product overview. Ball valves and trust this catalogue will assist our customers in the selection and application. The double blockandbleed dbb cameron general valve twin seal plug valve reduces this constant wear by using two seating slips mounted independently on a tapered plug by dovetails, which mechanically retract from the seating surface prior to rotating. Double block and bleed ball valves, process ball valves. Api defines dib as a single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from a single source, with a means of ventingbleeding the. Double block and bleed valves with floating balls and soft seats. Where necessary, peek as seat material and duplex as ball material are provided. Valves are typically used on hydrocarbon applications to minimize the size and weight of the pipevalve assemblies associated with gauge pressure or analytical instrumentation. Trunnion mounted ball valves double block and bleed flowserve. By combining customer specified valves into a single manifold, the number of leak paths is considerably reduced and. Mar 18, 2016 the cosasco double block and bleed service valve is designed to provide an extra layer of protection to ensure maximum safety requirements are met. Slimlines incorporate a primary isolate piping valve and combine also the instrument block.
A wide variety of double block bleed valve options are. Applications hoke block ball valves hoke blocks are used as a primary processpiping isolation valve to provide double block and bleed. You dont want to shut down the entire facility, so you decide to block off and depressurize just the section youre working on. Rapid seal abrasion is inherent in the designs of most ball and gate valves. It also cuts down the number of leak paths to the atmosphere, reducing the risk of hazards when transferring liquids dangerous to humans or the environment. Parker hannifin corporation flanged products 3 primary, secondary and vent valve applications and installations design codes all parker hannifin double block and bleed designs comply with the following codes. Actuator mounting flanges, unless otherwise specified, are in full accordance with iso 5211. Just upstream is a double block and bleed valve a trunnionmounted ball valve with selfrelieving seals and a bleed valve to vent the cavity. B double block and bleed ball valves are designed and manufactured strictly to international standards asme b16. This full port quarter turn double ball valve is designed for operation up to 15,000 psi 1034 bar. Some solid reasons to buy double block and bleed valve kplok.
Locking device on every valve balon series t valves, like all balon gear operated valves, feature standard locking devices in all sizes. Butechs double block and bleed ball valve combines two isolating ball valves and a central needle bleed valve into one compact manifold. Defining double block and bleed pipe, valve and fitting. This innovative arrangement provides two ball valves for upstream and downstream isolation with the third valve used to drain and to ensure total downstream isolation of the system.
This reliable ball valve is an excellent method to block and bleed high pressure hydraulic and pneumatic systems used for pressure monitoring and test, chemical injection and drain line. Single and double block and bleed valve 7 ordering information two piece bolted design. First isolation is to a full piping valve asme v111 specification, ball. All dimensions shown in this catalogue are approximate and subject to change. Contents introduction application installaltions specification ball valve type. To improve the valves integrity, we have incorporated a superior slip design and more durable body. Double block and bleed valves dbb are used in the process industries to provide double isolation for additional safety such that the upstream fluid does not reach the downstream plant equipment. Api 6d defines a double block and bleed valve as a single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve with a means of vendingbleeding the cavity between the seating surfaces.
Standard ball valves are furnished in 316 ss with specials materials available. Floating ball design and trunnion ball design vent. The double block and bleed valve or a dbbv can perform the tasks of 3 separate valves 2 separate isolations and 1 drain valve which apart from being hugely space saving can also save on weight and time due to installation and maintenance practices requiring much less work and the operator being able to locate and operate all 3 valves in one. Danex double block and bleed plug valve animation duration. Double block and bleed needle valves high pressure company. Valves 1 contents primary isolation valve applications. By combining two valves into one body, the twin valve reduces weight, envelope dimensions and potential leak paths.
But, be careful sometimes the bleed from a double block and bleed needs to be capped or plugged. The term double block and bleed initially meant two separate block valves with a pipe and bleed valve between the valves to check for leakage. Trunnion mounted dbb ball valve bolted type double block and bleed valves double block and bleed valves assure double isolation function thanks to two obturators inserted in a single body and they provide the bleed function by means of a bleed vent system located between obturators body port and ball, gate or needle valve. True meaning of double block and bleed valve magazine. One piece, trunion mounted stem design eliminates shear failure and reduces the effects of side loading found in two piece designs.
The western valve danex is an accepted block and bleed valve dbbv as it has two independent seating slips that are mechanically expanded against the body seat by the downward movement of the tapered plug. 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. Now you can depressurize the line downstream and open it up to work on it. This new assembly provides great savings in weight, space and installation times especially in instrument or instrument cage isolation. This feature can be achieved with one single valves cw a bleed port between the obturators. Anderson greenwood primary isolation valves primary. Using a single double block and bleed valve system versus 3 separate valves saves installation time, weight on the piping system, and space. Double block and bleed valve is a sideentry ball valve, with either a bolted or welded body, designed for use in upstream, midstream and downstream oil and gas applications. The double block and bleed isolation philosophy requires two inline isolation valves and a bleed valve, used to drain or vent trapped fluid between the two closure elements in order to safely isolate safely the downstream pipe. Trunnion ball valve special features balon corporation. This article will be a guide about the system of double block and bleed valves, their types, applications, working, features and function.
Issues with double block and bleed the role of double block and bleed appears to be fully accepted across the process industry. Plant designers know they need to provide two block valves with a vent or drain valve in between on. We are a wellknown as double block bleed valve manufacturers, please find above 9. According to api 6d specification for pipeline valves standards, a double block and bleed dbb valve is a single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve, with a means of ventingbleeding the cavity between the seating surfaces.
Double block and bleed valves have evolved to replace the process of bolting together individual valves to provide dual isolation. Spanner actuation sa oliver tamperproof spanner actuation for ball. Double block and bleed ball valves parker autoclave engineers. A single double block and bleed valve replaces each pair of these valves. All parker hannifin double block and bleed designs comply with the following codes. Build a process interface valve ordering number by combining the designators as.
Plant designers know they need to provide two block valves with a vent or drain valve in between on all process connections to items of plant and equipment. Ce marking in compliance with ped directive 9723ec. These savings can be as much as 60% in weight and studies have shown that a 70%. Double block and bleed with ultralow emission options. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. For example, the vent on a double block and bleed used to stop material flow by a safety shutdown system most likely needs to be open when the plant is in operation. Double block and bleed flanged products royal instruments. Our valves feature coned and threaded connections for 14 to 1 medium pressure tubing, making them ideal for pressure monitoring and testing, chemical injection and drain line isolation applications. See catalogue 4190hbv hipro ball valve for high performance. Double block and bleed its more complicated than you think. As shown above, two pairs of conventional valves must be used for block and bleed service in a fuel oil and gasoline storage system. By combining piping and instrument valves in a single assembly, they. Single and double block and bleed valve 7 ordering information two piece bolted design designator. The bleed and vent valves ensure that fluid is drained from the cavity between the seals and to drain any fluid downstream of the process stream.
Locking device on every valve balon series t valves, like all balon gear operated valves, feature standard locking devices in. Carbon steel double block and bleed valves have stainless steel end. Its time to do maintenance on a section of process. It requires two inline isolation valves and a bleed valve used to drain or vent trapped fluid between the two closure elements in order to safely isolate the downstream pipe. Headquarters and factory anfeng industrial park dongou industrial zone, oubei, wenzhou. The cameron general valve twin seal double block and bleed dbb plug valve reduces this constant wear by using two seating slips mounted independently on a tapered plug by dovetails, which mechanically retract from the seating surface prior to rotating.
The double block and bleed system requires the use of two valves and a spool piece. General valve twin seal dbb valve schlumberger products. This short and compact design results in less space requirements and less weight. The design provides an effective method for mounting gauges with facility to test and calibrate gauges and pressure switches. Double block and bleed ball valves on parker autoclave. The combining of piping and instrument valves into a single unit has benefitted. The integrated and compact designs along with a precise construction of double block and bleed valve make them a highly reliable solution for complicated multiple instrument valve systems. Every balon series t includes a bleed fitting for double block and bleed, and every valve allows grease injection for secondary sealing. Double block and bleed valve 3d cad model library grabcad. Trunnion mounted ball valves double block and bleed. Butech also offers double block and bleed needle valves and single block and bleed needle valves in various sizes and materials for higher.
Stainless steel instrumentation isolation block and bleed valve, 12 in. Carbon steel double block and bleed valves have stainless steel. Just upstream is a double block and bleed valvea trunnionmounted ball valve with selfrelieving seals and a bleed valve to vent the cavity. High pressure equipment company introduces its double block and bleed needle valves that deliver safe, reliable operation to 20,000 psi. The tk twin valve utilizes the proven tk design in a twin ball body satisfying. General features introduction features designed in accordance with industry. Double block and bleed ball valves high pressure equipment has designed a trunion style block and bleed ball valve for calibration applications to 15,000 psi. Dimensions are for reference only and subject to change. Every balon series t includes a bleed fitting for doubleblock andbleed, and every valve allows grease injection for secondary sealing. Over 100 000 double block and bleed and monoflange valves installed.
Double block and bleed ball valves high pressure company. Process interface in one compact ballneedleball valve. The flanged body drop forging is machined to ansi b16. A bleed valve is used to drain the spool and verify seal integrity. Choise of this combination results in the elimination of taper thread connections and the need for thread sealant. Superlok can offer the special combination of double block and bleed valve systems together with fittings, both being designed and produced by bmt. When assured valve shut off and absolute isolation are required, dafram provides double block and bleed valves that consist of two main inline isolation valves and a bleed valve, used to drain or vent trapped fluid between the two obturators. A twin ball double block and bleed valve can have the same facetoface dimension of a standard ball valve weight and costs saving same characteristics of daftam standard series split body or fully welded construction. Your benefits at a glance highquality materials use of highquality materials for maximum performance. Stainless steel instrumentation isolation block and bleed. This article, on the true meaning of double block and bleed initially ran on june 1, 2010. A wide variety of double block bleed valve options are available to you, such as high pressure, low pressure.
Recognising the need for plant safety during maintenance, flowserve worcester have developed a double block and. Double block and bleed ball valves parker autoclave. Double block and bleed valves bonney forge corporation. A double block and bleed valve is like having three valves in one.
445 778 1287 797 201 1411 619 335 735 1142 407 43 23 385 571 1402 776 525 681 667 116 305 73 31 232 190 561 119 317 1303 727 504 1349 1239 817 141 632 320 684 1322 1493