EXECUTIONS DBBV S t a n d a r d e x e c u t i o n Part no. Description

Transcription

1 Double Block and Bleed Dual Expanding Plug Valve

2 EXECUTIONS DBBV S t aa n d aa rr d ee xx ee cc u t i o n Part no. Description 1 Body 2 Lower plate 3 Upper plate 4 Plug 5 Slip 6 Seat seal 7 Stem 8 Yoke 10 Adjusting bushing 11 Gland 12 Back seat 13 Gland flange 14 Helix trunnion 15 Helix trunnion fixing plate 16 Roll pin 17 Stem pin 20 Gasket 21 Packing 23 Name plate 30 Body nut 31 Body / lower plate stud 32 Body / upper plate stud 33 Gland stud 34 Upper plate / yoke stud 35 Gland nut 36 Upper plate / yoke nut 37 Key 40 Stem nut 41 Top flange 42 Handwheel 43 Bolt 44 Washer 45 Nut 46 Protection pipe 47 Position indicator 48 Bearing plate 49 Bearing 56 Nut 81 Drain plug 82 Lifting lug 83 Grease nipple 84 Automatic body bleed 91 ABB detection ring 93 Setscrew

3 FEATURES DBBV F ee aa t u rree ss o f C o n t rr o l S ee aa l l D o u b l ee B l o cc kk & B l ee ee d V aa l vv ee ss Friction Free An important aspect of a valve is the sealing mechanism. Almost all valves, like standard Ball, Gate and Butterfly valves have their sealing mechanism based upon shear force, friction and tearing. The Control Seal sealing mechanism is based upon a radial movement only. The sealing is not liable to shear, friction or tearing. This means no abrasion on the seal and compared to other type of valves, results into an exceptional long lifetime. Double Block and Bleed Control Seal valves have a double block and bleed function up and downstream. Normally this can only be achieved by using two (2) valves and a spool piece with a drain valve. The use of a Control Seal Double Block and Bleed Valve will safe cost, space and maintenance for a long period. In-line maintenance and service As the Control Seal valve is designed for easy and low cost maintenance Stem packings can be adjusted while the valve is in service. All valves are executed with a back seat. Bottom and top entry is possible while the valve is inline. No special tools are required. Non-Slam The self-locking operate mechanism on all Control Seal valves, provides that the closing member (plug) cannot rotate due to line forces. Therefore there is no danger of line slam, shock or injury of personnel. Fire Safe The Control Seal valves have been Fire safe tested by independent laboratories and has passed the test to BS 6755 part 2 and API 6FA succesfully. These tests have been performed by Lloyds on several valves. Advantages of the Control Seal design. Friction free opening and closing, increasing the lifetime of the valve. Corrosion and wear resistant materials are used on the closure members. Bottom and top access for inline inspection and maintenance. Adjustable stem packing while the valve is in service. All valves are executed with a backseat, which gives the possibility to renew stem packing under pressure. Non lubricated seal. Pressure independent sealing. No coupling cam in the stem construction. Topworks according to ISO 5210 Optional valve executions Control Seal valves can be supplied in a variety of materials and are also available in accordance with DIN standards. Stem extensions and gas column for cryogenic service Control Seal Double Block and Bleed Valves can be supplied with various types of Viton, which depends on the medium. For remote controll electrical, pneumatic and hydraulic actuators can be installed. Double Block & Bleed Valve applications Double Block & Bleed expanding plug Valves are often used in the following applications: Fiscal metering systems for gas and oil Ship and truck loading services Tank storage Transport pipeline services Clean hydrocarbon services Aviation fuel services MTBE services

4 HOW IT WORKS O p ee n i n g aa n d cc l o ss i n g ss ee q u ee n cc ee D B B V 1. Open Valve fully open. Seating slips are protected from flow path. 4. Double Block and Bleed Valve seated. Resilient seals have been compressed. Resilient seals cannot be damaged by operator over-torque. Double block and bleed function can be tested by opening the bleed valve. 2. Rotating Plug is rotating. There is no contact between body and seating slips. 5. Start to open Valve starts opening. Plug moving up, retracting slips from the body seats. Strong dovetail and stems retract the slips. Plug is kept centred in body by top and bottom bushings. 3. Expanding Plug / slips have rotated 90. Plug starts expanding slips. Slips only move perpendicular to body seats. Plug / slip assembly is kept centred in body by top and bottom bushings. 6. Slips retracted Slips have been retracted prior to rotation. (Further workings as figure 1 and 2 in reversed order).

5 BLEED SYSTEMS B l ee ee d ss yy ss t ee m ss f o rr D B B V Automatic Body Bleed (ABB) The Control Seal Double Block and Bleed Valve automatic body bleed is actuated when the valve is closed. As an option the isolating valve can be provided with lock open to avoid any human error. Manual Bleed Valve with Gauge (MVB-G) A manual bleed valve connected with gauge can be provided when emission is undesirable. The gauge will indicate the cavity pressure and the seal tightness. Note: Body pressure can be increased due to thermal effects, which can indicate false leakage. Thermal Relief Upstream with Gauge (TRU-G) To avoid body pressure due to thermal expansion, a relief valve with gauge can be provided. This means no emission to the atmosphere and no sump system is required. Relief always set on 25 psi. Manual Bleed Valve (MBV) Bleed valve for manual operation. The Control Seal Double Block and Bleed Valve must always be bleeded in closed position. The MBV is the most simple bleed system. Caution: When the Double Block and Bleed Valve comes to its closed position, a cam opens the Automatic Bleed Valve allowing fluid to escape. As the valve reaches its fully closed position, the spurting liquid should cease, showing positive verification of double seating. A proper drain system is required as spilled liquid could be hazardous. Thermal Relief Upstream (TRU) Manual Bleed & Thermal Relief (MBTR) With this system on the Control Seal Double Block and Bleed Valve, the thermal relief valve releases the overpressure from the body cavity which may be caused by thermal expansion. The system releases from the body cavity to the upstream side of the This principle is the same as that of the TRU, however with the possibility to check the integrity of the Double Block and Bleed Valve manually. valve. Note: The relief valve is set to open at 25 psi on all valves regardless of their working pressure. With the Control Seal Double Block and Bleed Valve closed, the relief valve will open at 25 psi above upstream pressure. This system functions only when the Control Seal DBBV is closed and the isolation valve is open. Caution: All automated Control Seal Double Block and Bleed Valves require some form of body pressure relief (TRU / MBTR / ABB / MBV-G / TRU-G), otherwise the valve may be difficult to open or may stick in closed position.

6 APPLICATIONS DBBV D u aa l E xx p aa n d i n g D o u b l ee B l o cc kk & B l ee ee d P l u g V aa l vv ee ss G ee n ee rr aa l D aa t aa Design, dimensions and marking according to: API specification 599 API specification 600 Construction: 3-piece construction, split body, top and bottom entry, trunnion mounted, antistatic design, seating slips replacable through removable bottom plate, reduced or full bore. Characteristics: Non contact, duel expanding, Double Block & Bleed Plug Valve Face to face dimensions according to: ANSI B16.10 Manufacturers standard Flanged connections according to: ANSI B16.5 Raised Face smooth finish or Ring Type Joint MSS-SP-44 Raised Face smooth finish or Ring Type Joint Fire Safe accoring to: BS 6755 part 2 including API specification 6FA Marking in accordance with: MSS-SP-25 European Directive PED 97/23/EC Optional Marking to client specification Testing according to: API 6D API 598 BS 6755 part 1 Operating devices: Handwheel Gearbox Actuator Bottom drain plug: Standard included Control Seal Double Block & Bleed Valves in line

7 C o n t rr o l S ee aa l T MM d ee l i vv ee rr yy p rr o g rr aa m m ee DELIVERY PROGRAMME Double Block and Bleed Valves (DBBV) Size: 1½ up to and including 42 Class: 150# up to and including 900# Rising Stem Ball Valve (RSBV) Size: 1 up to and including 42 Class: 150# up to and including 2500# Axial Flow Valve (AFV) Size: 4 up to and including 48 Class: 150# up to and including 2500# For a full catalogue please contact Control Seal: Phone: +31 (0) Fax: +31 (0) info@controlseal.nl sales@controlseal.nl

8 Control Seal B.V. Sales, Engineering & Services Office: Waardsedijk Oost 10-4, 3417XJ Montfoort, the Netherlands Phone: +31 (0) , Fax: +31 (0) Head Office & Manufacturing Facility: Farmsumerweg 43, P.O. box 330, 9900AH Appingedam, the Netherlands Phone: +31 (0) , Fax : +31 (0) sales@controlseal.nl, Website: