Typical Feed Water Heater Isolation System.
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- Alyson James
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1 Type AVS 4/5 Typical Feed Water Heater Isolation System. Features and Benefits These valves are designed to bypass high pressure feedwater around a group of heaters in the event of high water level in the shell caused by a defective tube, weld or drain system. The time available to give protection to a turbine in modern feed systems is short but these valves can operate in approximately 5 seconds in a 300mm bore pipe system with the minimum of hydraulic shock. Protection is achieved in the system by installing fast closing tee and changeover valves in the pipework around a heater or group of heaters. These valves are equally applicable in new or established stations. The motive power employed is the feedwater pressure and the system is designed to 'fail safe' in that the heaters will be by-passed if either electric or pneumatic supplies fail. Technical data Sizes : DN 80 - DN 500 Construction : DIN 3840 Pressure Class : PN PN 500 Tyco reserves the right to change the contents without notice SEMDR-0008-EN-0202
2 Type AVS 4/5 Operation In case of damage happening to the preheater pipes, the feedwater supply upstream of the pump and the feed-water backflow from the boiler to the preheater must be shut off in the shortest possible time. Quick shut off and deviation of the flow will both prevent the preheater steam jacket designed for low pressures from being endangered, and also maintain the feed-water supply to the boiler. Moreover, the turbine is protected against water breaking in by flow backs through the bleeder pipe. Due to the automatic shut off of the preheater and the simultaneous opening of the by-pass line, the feed-water keeps on flowing steadily. Even excessive pipe lenghts between the pump and the AV5 valve will not create any additional dynamic forces. Due to the deviation of flow, the water column contained in the by-pass will have to be accelerated. Short by-pass pipes will keep such acceleration forces on a low level. The AV quick closing valves are controlled by their own medium and will respond within a second's time, without varying operating forces and almost free of friction, because the valve seating faces close axially and do not slide on each other, as e.g. with gate valves. If the feed-water pressure within the preheater pipes rises due to faulty control or during trial runs, the AV valves will act as safety valves and open slightly. In normal operation pump pressure will prevail in the inlet of the AV5 changeover valve. Due to pressure losses, the pressure in the by-pass line is somewhat lower. This pressure differential as well as the balanced stem that is passed to the outside, will safely hold the disc of the AV valve in open position, providing a shut off towards the by-pass. Minor pressure fluctuations within the range of 5% of the inlet pressure will not affect the operation of the AV valves. Higher pressure variations will have to be checked and may require a change in design. In case of damage in the preheater, the level control emits an electric impulse to the solenoid control valve, in addition to possible optical and audible warnings. The valve opens and relieves the cylinders "A" of the AV valves. Cylinders "B" receive the full pressure of the feed-water line via a small passage, which causes the discs to move into their closing positions. The preheater is no longer in operation and the feed-water flow passes through the by-pass line. When the solenoid control valves closes, the AV5 changeover valve will only remain in its closed position, if the feed-water pressure in the preheater has lowered by at least 10% as compared with the pump pressure and does not rise again. Therefore, with power test runs, the AV valves will open automatically, and the preheater is put into operation again, as soon as the solenoid control valve is closed. This automatic opening is effected by the valve stems being balanced and passed through to the outside. The pistons of the AV valves have been so dimensioned, that any opening towards the preheater is prevented, if the latter is pressureless or under low pressure. This design prevents any sudden and harmful admission of pressure to the preheater piping. For the start-up or after repairs the preheater is filled via the refill pipe by the pump line. Only then the AV valves can be opened, or will open automatically after the pressure has been balanced within the system. With low operating pressures, the open hand-operated control valve relieves the cylinder "B" sufficiently for allowing the disc to move into its open position. + + Balance pipe Special No. 372 A2 valve interlocking + Outlet to Boiler * = are no part of our delivery programme Quick closing change over valve Inlet from pump Reversing valve VA 500 Refill pipe Refill valve A B B A Preheater Balance valve Special No. 372 A2 valve interlocking AVS5 + Special No. 37 Position Indicator open Special No. 36 Position Indicator closed * Control pipe Bypass line * Level control Special No. 36 Position Indicator closed Special No. 37 Position Indicator open AVS4 Quick closing check valve Time delay relais of appr. 30 sec. c1 * Stop valve VA 500 Special No. 371 A4 valve interlocking (open blocked) c2 * Solenoid control valve EMS- Time delay relais of appr. 30 sec. Closing the solenoid control valve after changeover is necessary, because a permanent relief via the control pipe may cause erosion. As shown in the drawing, a corresponding closing impulse is emitted by the electric indicator (SN 36) in "closed" position. Contactors C1 and C2 are lagging at approx. 30 seconds. Design Quick - Closing Check Valves Check Valves AVS4. AVF4 Three way valves AVS5. AVF5 Size of seat Maximum Flow Quantity Type Cast steel DIN - PN DIN- DIN-PN PN25-40 Forged Steel DIN - PN Control Pipes DIN-DN 15 DIN-DN 25 t/h Control Valves For AV Valves Close EMS1 to EMS4 Solenoid Control Valves Other control valves on request Open Automatically VKS11-Stop Valve Min.(bar) type Forged Steel Cast Steel Forged Steel Cast Steel Equipment Type ST.KG Spur Gear and bevel Gear Type FA Remote driving parts E-Actuators Size and connect. acc. to ISO 5210 Quick - Closing Check Valves For easy mounting of the AV valves, they should preferably be installed in vertical position. Their pressure losses are equivalent to 90 bands and are substantially more advantageous as compared with T-fittings. In case of preheater groups, the valve bodies being designed as fittings, may serve for the feed-water line to be distributed to the individual preheaters. Our technical datasheets will inform you on the possible number of connections, their relative positions and sizes. Control Valves The feed-water pressure being used as the source of energy for operating the AV valves necessitates minimum overpressures in the preheater system as shown in the adjoining column. Where valves are to be activated by solenoid control valves at lower pressures, the AV valves will have to be modified according to individual requirements. Equipment The blocking stem enables the AV valves to be closed independently from the solenoid control. The blocking stems must not be used for closing the disc against the full operating pressure. The AV4 non return valve must not be closed before the AV5 changeover valve has been blocked. The blocking stem can be operated by handwheel or by remote drives as per margin. For the maintenance of the solenoid control valve during operation, the stop valve can be closed after the preheater protection has been changed over to bypass operation and the blocking stems have been actuated. This procedure is guaranteed by the valve interlockings SN 322 and SN 341 provided. Tyco reserves the right to change the contents without notice page 2
3 Quick closing check valve - Type AVS 4 PN : cast steel PN : forged steel / / / / / / Class PN (100) (160) (250) (320) Trim Body Disc Piston seat surface seat surface rod No Part No 1 Part No 4 Part No % Cr 17% Cr 13% Cr Tyco reserves the right to change the contents without notice page 3
4 Quick closing check valve - Type AVS 4 Parts list Part Part name Material Code 01 A A182F body A A182F middle part of the body A A182F inlet connecting pipe A A182F outlet connecting pipe A A182F hardfacing Chromium steel Chromium steel Chromium steel Chromium steel Chromium steel Chromium steel 1.7 welding seam 1.8 welding seam 2 cover A A182F cylinder / / / / / / part. Cr-plated part. Cr-plated part. Cr-plated part. Cr-plated part. Cr-plated part. Cr-plated 4 disc A A182F hardfacing Chromium steel Chromium steel Chromium steel Chromium steel 5 rod with piston / / / / par. Cr-plated par. Cr-plated par. Cr-plated par. Cr-plated 8 disc stem connection split ring ring tightening plate split ring convex seal flange control stud bolt hexagonal nut piston ring segment ring A182F A182F ring A A182F cover seal Graphit/ Graphit/ Graphit/ Graphit/ base ring packing Graphit Graphit Graphit Graphit 29 gland shaft gland flange stud washer Ferrite Ferrite Ferrite Ferrite 34 hexagonal nut stud hexagonal nut allan bolt A4 A4 A4 A4 38 name plate roundheaded notched nail Austenite Austenite Austenite Austenite 41 bonnet Divers Divers Divers Divers 42 spindle indicator ring indicator ring guide bolt threaded bush ring bearing axial-needle bearing ball bearing steel ball bearing steel ball bearing steel ball bearing steel 49 threaded pin Ferrite Ferrite Ferrite Ferrite 50 pipe nut Ferrite Ferrite Ferrite Ferrite 51 fitting key hand wheel lubrication nipple Ferrite Ferrite Ferrite Ferrite 55 tightening pin Springsteel Springsteel Springsteel Springsteel 58 bonnet holder Divers Divers Divers Divers 59 limit switch Divers Divers Divers Divers 59.1 allan bolt Tyco reserves the right to change the contents without notice page 4
5 Quick closing check valve - Type AVS 4 Welding Ends PN Size of Seat diameter DN Inlet DN Outlet Bypass Dimensions in mm Weight seat mm mm mm mm S H1 H2 H3 h D a c kg 160/ / Welding ends as specified by customer Tyco reserves the right to change the contents without notice page 5
6 Quick closing three-way valve - Type AVS 5 PN : cast steel PN : forged steel / / / / / /36 56/ zum Steuerventil to control valve zum Handventil to stop valve Class PN (100) (160) (250) (320) zum Handventil to stop valve zum Steuerventil to control valve Trim Body Disc Piston seat surface seat surface rod No Part No 1 Part No 4 Part No % Cr 17% Cr 13% Cr Tyco reserves the right to change the contents without notice page 6
7 Quick closing three-way valve - Type AVS 5 Parts list Part Part name Material Code 01 A A182F body A A182F middle part of the body A A182F inlet connecting pipe A A182F outlet connecting pipe A A182F bypass connecting pipe A A182F hardfacing Chromium steel Chromium steel Chromium steel Chromium steel Chromium steel Chromium steel 1.6 hardfacing Chromium steel Chromium steel Chromium steel Chromium steel Chromium steel Chromium steel 1.7 welding seam 1.8 welding seam 1.9 welding seam 2 cover A A182F indication plate indication plate cylinder / / / / / / part. Cr-plated part. Cr-plated part. Cr-plated part. Cr-plated part. Cr-plated part. Cr-plated 4 disc A A182F hardfacing Chromium steel Chromium steel Chromium steel Chromium steel 4.2 hardfacing Chromium steel Chromium steel Chromium steel Chromium steel 5 rod with piston / / / / par. Cr-plated par. Cr-plated par. Cr-plated par. Cr-plated 8 disc stem connection split ring ring tightening plate split ring convex seal flange control stud bolt hexagonal nut piston ring piston ring segment ring A182F A182F ring A A182F cover seal Graphit/ Graphit/ Graphit/ Graphit/ Graphit/ base ring packing Graphit Graphit Graphit Graphit 29 gland shaft gland flange stud washer Ferrite Ferrite Ferrite Ferrite 34 hexagonal nut stud hexagonal nut allan bolt A4 A4 A4 A4 38 name plate roundheaded notched nail Austenite Austenite Austenite Austenite 41 bonnet Divers Divers Divers Divers 42 spindle indicator ring indicator ring guide bolt threaded bush ring bearing axial-needle bearing ball bearing steel ball bearing steel ball bearing steel ball bearing steel 49 threaded pin Ferrite Ferrite Ferrite Ferrite 50 pipe nut Ferrite Ferrite Ferrite Ferrite 51 fitting key hand wheel lubrication nipple Ferrite Ferrite Ferrite Ferrite 55 tightening pin Springsteel Springsteel Springsteel Springsteel 56 stud hexagonal nut bonnet holder Divers Divers Divers Divers 59 limit switch Divers Divers Divers Divers 59.1 allan bolt manual control valve Divers Divers Divers Divers Tyco reserves the right to change the contents without notice page 7
8 Quick closing three-way valve - Type AVS 5 Welding Ends PN Size of Seat diameter DN Inlet DN Outlet Bypass Dimensions in mm Weight seat mm mm mm mm S H1 H2 H3 h D a c kg 160/ / Welding ends as specified by customer Tyco reserves the right to change the contents without notice page 8
9 Quick closing three-way valve - Type AVS Parts list 1 Pickling cylinder 2.1 Pickling disc 2.2 Pickling stem 2.3 Tightening screw 2.4 Sealing plate 2.5 Holding plate 2.6 Allan bolt 3 Guide ring 4 Guide bolt 5 Dummy convex seal 6 Packing 8 Allan bolt 9 Gasket AVS Example for designation of check valves Standard accessories Material Specification Size of extra connections Outlet nominal size Inlet Nominal Size Nominal Pressure Seat size Type of Valve, abbr. Locations of connections for seat sizes The maximum number of connections of the outlet plane is 4 of limited size. There must be at least 90 between adjacent connections. Their number, sizes and angular positions must be stated upon ordering or inquiring. The angular positions of the control connection (16) is independent of the connections of the valve body. It can be fixed in any desired position after loosening the hexagonal nuts (36, 57, 58.2). Where an extra manual control valve SN 66 is employed, it should be fitted exactly opposite (180 ) to the control connection (16). Tyco reserves the right to change the contents without notice page 9
10 Quick closing three-way valve - Type AVS Parts list Pickling cylinder 2.1 Pickling disc 2.2 Pickling stem 2.3 Tightening screw 2.4 Holding plate 2.5 Allan bolt 2.6 Allan bolt 3 Guide ring 4 Guide bolt 5 Dummy convex seal 6 Packing 7 O-Ring 8 Allan bolt 9 Gasket AVS Example for designation of three-way-valves Standard accessories Material Specification Size of extra connections Bypass nominal size Outlet nominal size Inlet Nominal Size Nominal Pressure Seat size Type of Valve, abbr. Locations of connections for seat sizes Maximum number of connections of the inlet and bypass plane is 4 of limited size. There must be at least 90 between adjacent connections. Their number, sizes and angular positions must be stated upon ordering or inquiring. Normally the control connection (16) is positioned above the inlet connection (1.2) and the manual control valve (61) is placed at 180 C to the control connection. It can, however, be fixed in any position after loosening the hexagonal nuts (36, 57, 58.2), provided the position of connection and valve remains unchanged with reference to their opposite position of 180. Tyco reserves the right to change the contents without notice page 10
11 Solenoid control valve - Type EMS 3-4 and EMF 3-4 Parts list ASV4 1 Lid 2 Tightening screw 3 Threaded stem 4 Hexagonal nut 5 Tightening plate 6 Shutt off plate 7 O-Ring 8 O-Ring 9 O-Ring 10 Ring screw 11 Safety ring 12 Cylinder slotted pin AVS4 Parts list ASV5 1 Lid 2 Tightening screw 3 Threaded stem 4 Hexagonal nut 5 Tightening plate 6 Shutt off plate 7 O-Ring 8 O-Ring 9 O-Ring 10 Ring screw 11 Safety ring 12 Cylinder slotted pin AVS5 Tyco reserves the right to change the contents without notice page 11
12 Quick closing check valve - Type AVS 4 Standard Accessories Manual Control Valve (SN 66). Tyco reserves the right to change the contents without notice page 12
13 Quick closing three-way valve - Type AVS 5 Standard Accessories Hydraulic brake to increase opening and closing times by several seconds (SN 74). Detail Z Z Detail Y Y Tyco reserves the right to change the contents without notice page 13
14 Type AVS 4/5 E M S Example for Solenoid Control Valve Specification Standard accessories Materials Specification Inlet Nominal Size Control Principle Outlet Connection Solenoid Control Angle Type Body Installation Solenoid Control Valves are designed to quickly and reliably believe and load the control chambers of valves controlled by their own medium. They are employed for activating preheater safety devices, quick-closing and opening valves as well as controlled safety relief valves. Their inlet is either directly connected to the standard connections of the controls or through the intermediary of control pipes. Existing safety regulations should be adhered to. Maximum nominal pressures must not be exceeded, and control pipes should not be smaller in diameter than the connections of the control valves. Suitable controlling instruments may be connected to the respective bores. Design Materials are specified for all parts exposed to pressure, for those giving tight seal to atmosphere and for spares. Inlet connection (3) is also available in different materials if local operating conditions should render it necessary. Other material specifications on request. All major internal parts are made from high-alloyed, wear resistant materials with guaranteed physical properties and coefficients of expansion. In case of damage, e.g. by foreign matter or where parts are worn after continuous heavy service, exchange of such parts is recommended by making use of our ex store spare kits. Please state rating plate particulars when ordering or inquiring. Operation EMS3. EMF3 De-energized, Solenoid Valve Open, indirect operation With Solenoid (57) de-energized, disc (29) is pushed into " open "position against the service pressure by the biased cup springs via stem (40). The upper side of the check disc (25) becomes pressureless and moves upward into "open "position. Upon the current being switched on, solenoid (57) will return to its initial position against the force of the cup springs. Spring (30) assisted by the service pressure causes disc (29) to close smartly onto its seat. This closing action is also assisted by the service pressure generating above check disc (25). EMS4.EMSF4 Energized, Solenoid Valve Open, indirect operation With Solenoid (57) energized, disc (29) is pushed into" open" position against the service pressure by magnetic force via stem (40). The upper side of the check disc (25) becomes pressureless and moves upward into "open" position. Upon the current being switched off, pressure spring pulls solenoid (57) back to its initial position. Spring (30) with the aid of the service pressure pushes disc (29) into closed position. This closing action is also assisted by the service pressure generating above disc (25). Table??? Tyco reserves the right to change the contents without notice page 14
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