Full lift safety valve with spring loading.(ait)

Transcription

1 Full lift safety valve with spring loading.(ait) Model 6 V EP AP ES CP The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally. Design in accordance with ASME code section VIII. Materials according ASME code section II and ASTM. Connections according ASME/ANSI B.5-9 standard. Center to face dimensions according API-526. In accordance with the requirements of directive 97/23/EC. EC valve verification certified by: TÜV Internacional Grupo TÜV Rheinland, S.L. EC Type (Module D) EC examination report nº certified by: TÜV Internacional Grupo TÜV Rheinland, S.L. In compliance with the ATEX 9/9/CE directive Protective equipment and systems for use in potentially explosive atmospheres. Other authorisations: ISCIR, ITI, NASTHOL,...etc. Specifications 90 angular flow. Activated by direct action helicoid spring. Simplicity of construction ensuring minimum maintenance. Materials carefully selected for their resistance to corrosion. With the exception of washers and couplings, the valves are free of non-ferric materials. Internal body designed to offer favourable flow profile. Sealing surfaces treated and balanced, making them extremely tightness, even exceeding API-527 requeriments. Great discharge capacity. For liquids typically used with openings similar to proportional safety valves. Equipped with draining screws for removing condensation. Auto-centering plug. Threaded shaft with lever positioner facilitating immediate manual action. Elevator, independent of the seal, designed facilitate sudden opening when the steam expands and, with any fluid, guarantees absolute opening and closing precision. All the valves are supplied sealed at the set pressure requested, simulating operational conditions, and are vigorously tested. All components are numbered, registered and checked. If requested in advance, material, casting, test and efficiency certificates will be enclosed with the valve, and the instruction manual, in accordance with P.E.D.97/23 EC.

2 IMPORTANT Depending on demand: 1.- Blocking screw which facilitates hydrostatic testing of the container which to be 1.- protected. 2.- Rapid limiter to reduce the coefficient of discharge. 3.- Fluorelastomer (Vitón) seals, Silicone's rubber, PTFE (Teflón)... etc., achieving 3.- leakage levels less than Pa cm3-3 0,3 x seg. The ranges of application allow certain flexibility although we recommend limiting them to: RANGE OF APPLICATION FOR THE SEALS FLUID SET PRESSURE IN bar 1,,0, 7,0 30,0 0,0 Saturated steam S V T Liquids and gases S V T TEMPERATURE IN C SEALS ACCORDING TO MANUFACTURERS RECOMMENDED BY VYC MINIMUM MAXIMUM MINIMUM MAXIMUM Silicone's rubber Fluorelastomer (Vitón) PTFE (Teflón) S V T (1) (1) For temperatures exceeding 230ºC apply metallic seal only.- Flourelastomer (Vitón) membrane and O-ring isolating the rotating or sliding.- parts from the working fluid. 5.- Electrical contact indicating open/closed. 6.- Balance bellows to: mmmprotect the spring from atmospheric influences. mmmensure outside of valve body is totally tightness. mmmlevel out external or self-generated back pressure. 7.- Possibility of manufacture in other types of material, for special operating con- 7.- ditions (high temperatures, fluids, etc.)..- Totally free of oil and grease, to work with oxygen, avoiding possible fire risks.- (UV-Oxygen-VBG 62). 9.- Special springs for critical temperatures N. PIECE PIECE CAST STEEL MATERIAL STAINLESS STEEL , 5, , , , 29, 30, 31 33, 3, Body Closed bell Open bell Hood Elevator Cam Lever Seating Plug Lead Spring press Separator Rod Lever shaft Gudgeon Ring Safety ring Spring Gland Hollow screw Hollow screw nut Buffer nut Rod check nut Nut Washer Stud Screw Cap Coupling Coupling Seal Seal Sealing wire Characteristic plate Plug Sealing disk Washer Coupling Limiter Membrane O-ring ASTM A2 - WCB ASTM A ASTM A2 - WCB ASTM A ASTM A (1) ASTM A (6) ASTM A AISI AISI AISI () AISI 5 AISI AISI AISI 5 AISI 70 AISI AISI 301 AISI 6150(2) AISI 5 AISI 15 AISI 15 AISI 15 AISI 35 AISI 5 AISI 35 Graphite Graphite Plastic Sealing wire AISI 30 Silicone's rubber Copper AISI ASTM A351 - CFM ASTM A351 - CFM ASTM A351 - CFM ASTM A351 - CFM ASTM A351 - CFM (7) AISI 30 ASTM A AISI 630 AISI 630 (5) AISI 301 AISI 301 AISI 301(3) Plastic Sealing wire AISI 30 Silicone's rubber NPS 1 x NPS 2 1"x2" a "x" OPERATING CONDITIONS OPERATING CONDITIONS Class Class PRESSURE IN bar MAX. TEMP. IN C MIN. TEMP. IN C PRESSURE IN bar MAX. TEMP. IN C MIN. TEMP. IN C,90 1 6, ,0 3,0, 0 1, lbs, lbs 39, , , , , ,52 26,67 2,27 26,67 15,6 1 0, ,70 35, lbs lbs ,60 300, ,0 50

3 EP AP ES CP Full lift safety valve with spring loading (AIT) model 6 - AP and CP. 1. Disassembly and assembly. 1.1 Disassembly. To replace the spring (22) or clean any of the internal components of the valve, proceed in the following manner: A - Withdraw the clip (1), using a punching tool, until the lever () comes free. B - Loosen the screws (3) and take the cap (6) off. C - Holding the spindle () steady, loosen the hollow screw nut () and the holow screw (2) until you note a realasing of the spring (22). D - Mark on the spindle () the position of the spindle lock-nut (27) and the adjusting nut (26). Loosen them and remove them. E - Unscrew the nuts (29) and remove them, together with the studs () and their washers (30). F - Lift the cover (3) or (2) and you will have access to all of the components. 1.2 Assembly. A - Place the safety-ring () on the spindle () and press it against the gasket (). B - In the spindle channel () connect the ring (19) and fix it to the security-ring (21). IIntroduce the elevator (7) into the upper part of the spindle () and press this against the previously described pieces. C - Enter the guide (13), the separator (15), the spring-press (1), the spring (22), the spring-press (1) through the upper part of the spindle () and press this against the previously descrobed pieces. D - Replace the assembly (3) and the cover (3) or (2). E - Place the washers (30) on the studs () and make up the nuts (29) diagonally, checking the correct alignment of the cover (3) or (2). F - Adjust the firing pressure with the hollow screw (2) and fix the adjustment position with the hollow screw nut (). G - Turn the spindle lock-nut (27) and the adjusting nut (26) to the position mrked (see 1.1.D) and make up against each other. H - Introduce the cap (6) and tighten the screws (3). I - Place the lever () and fix it with the fastener (1). 2. Adjusting the firing pressure. A - Proceed according to points 1.1.A, 1.1.B, 1.1.C. B - Proceed according to points 1.2.F, 1.2.H, 1.2.I. Full lift safety valve with spring loading (AIT) model 6 - EP. 1. Disassembly and assembly. 1.1 Disassembly. To replace the spring (22), or clean any of the internal components of the valve, proceed in the following manner: A - Move the lever (9) in direction C as far as the constructive catcher. B - Unscrew the cap () and remove. C - Holding the spindle () steady, loosen the hollow screw nut () and the hollow screw (2) until you note a realeasing of the spring (22). D - Mark on the spindle () the position of the spindle lock-nut (27) and the adjusting nut (26). Loosen them and remove them. E - Unscrew the nuts (29) and remove them, together with the studs () and their washers (30). F - Lift the cover (2) and you will have access to all of the components. 1.2 Assembly. A - Place the safety-ring () on the spindle () and press it against the gasket (). B - In the spindle channel () connect the ring (19) and fix it to the security-ring (21). Introduce the elevator (7) into the upper part of the spindle () and press this against the previously described pieces. C - Enter the guide (13), the separator (15), the spring-press (1), the spring (22), the spring-press (1) through the upper part of the spindle () in a correlative manner. D - Replace the assembly (3) and the cover (2). E - Place the washers (30) on the studs () and make up the nuts (29) diagonally, checking the correct alignment of the cover (2). F - Adjust the firing pressure with the hollow screw (2) and fix the adjustment position with the hollow screw nut (). G - Turn the spindle lock-nut (27) and the adjusting nut (26) to the position marked (see 1.1.D) and make up against each other. H - Change the coupling (39) and lightly tighten the cap (). Move the lever (9) towards position A as far as the constructive catcher. Definitively tighten the cap (). 2. Adjustig the firing pressure. A - Proceed according to points 1.1.A, 1.1.B, 1.1.C. B - Proceed according to points 1.2.F, 1.2.H. Full lift safety valve with spring loading (AIT) model 6 - ES. 1. Disassembly and assembly. 1.1 Disassembly. To replace the spring (22), or clean any of the internal components of the valve, proceded in the following manner: A - Unscrew the cap (5) and remove. B - Holding the spindle () steady, loosen the hollow screw nut () and the hollow screw (2) until you note a realeasing of the spring (22). C - Unscrew the nuts (29) and remove them, together with the studs () and their washers (30). F - Lift the cover (2) and you will have access to all of the components. 1.2 Assembly. A - Place the safety-ring () on the spindle () and press it against the gasket (). B - In the spindle channel () connect the ring (19) and fix it to the security-ring (21). Introduce the elevator (7) into the upper part of the spindle () and press this against the previously described pieces. C - Enter the guide (13), the separator (15), the spring-press (1), the spring (22), the spring-press (1) through the upper part of the spindle () in a correlative manner. D - Replace the washers (3) and the cover (2). E - Place the washers (30) on the studs () and make up the nuts (29) diagonally, checking the correct alignment of the cover (2). F - Adjust the firing pressure with the hollow screw (2) and fix the adjustment position with the hollow screw nut (). G - Change the coupling (39) and tighten the cap (5). 2. Adjusting the firing pressure. A - Proceed according to points 1.1.A, 1.1.B. B - Proceed according to points 1.2.F, 1.2.G.

4 NPS 1 x NPS 2 API Orifice Letter do π. do Ao = 2. H h 1 L 1 L 2 R D 1 K 1 Ι 1 b 1 DRILLS N. D 1 K 1 Ι 1 b 1 DRILLS N. D 2 K 2 Ι 2 b 2 DRILLS N. MODEL CAST STEEL STAINLESS STEEL 1 x 2 x 2 x2 1/2 11/2 x3 (2 x3 )* 2 x3 (3 x )* 3 x ( x6 )* D - E /" F (152)* 1/" G (152)* 1/" H /" J (11)* 136,5 (1)* 1/" L (11)*,5 (179)* 3/" Whitworth gas-tight cylindrical female thread ISO 22/ 1 de 197 (DIN-9) 1 79,2 15,9 1,7 1,9 17, ,7 19,5 1 9,6 15,9 17,9 11,3 21, ,7 19,5 1 9,6 15,9 17,9 11,3 21,1 139,7 22,7 1 9,6 15,9 17,9 11,3 21, , 2, ,7 19, , , 2, , 2,3 2, ,3 x 6 N , /" ,3 5,2 21,3,9 x 6 P ()* 11 (2)* 3/" ,3 5,2 21,3,9 6 x Q / 21,3,9 269, ,5 29 x T / 35 29, ,7, ,6, EP AP ES CP EP AP ES CP EP AP ES CP EP AP ES CP EP AP ES CP EP AP ES CP EP AP ES CP EP AP ES CP EP AP ES CP EP AP ES CP 150 Ibs 300 Ibs 150 Ibs 300 Ibs NPS1 EP NPS1 AP NPS1 ES NPS1 CP RECOMMENDED RANGES OF APPLICATION MODEL EP AP(1) ES FLUID INTERNAL OR 15 GENERATED EXTERNAL VARIABLE (1) EXTERNAL CONSTANT (1)(2)(3) % OVERPRESSURE CP (1) FLUID SATURATED STEAM OPEN AND CLOSED PRESSURES IN % OF SET PRESSURE PRESSURE IN bar OPENING PRESSURE CLOSING PRESSURE < 3 3 < % + 5 % + % + % - 0,3 bar - % - 0,6 bar - % (1) If external backpressure exists, the AP and CP model cannot be used. (2) With external constant backpressure, the spring is adjusted deducting the backpressure from the set pressure. (3) If the set pressure < 3 bar we must consider the total atmospheric pressure (1 bar) as external constant backpressure being freely released. If pa > 5p, we must limit plug speed with the consequent reduction of the αd coefficient of discharge. With the new reduced coefficient we determine the d0, in order to remove the necessary volume. pa = Backpressure permitted [bar] absolute. pa = Set pressure [bar] absolute. αd = Coefficient of discharge.

5 NPS 1 x NPS 2 SET PRESSURES AND REGULATING RANGES 1 x 2 x 2 x 2 1/2 x 3 (2 x3 ) 2 x 3 (3 x ) 3 x ( x6 ) x 6 x 6 6 x x API Orifice Letter D-E F G H J L N P Q T MAXIMUM ( AND ) 150 lbs 300 lbs MAXIMUM (SATURATED STEAM) 150 lbs 300 lbs MINIMUM STEAM AND 0 a 0, ,66 a 1, ,95 a 1, ,30 a 1, ,0 a 2, ,50 a 3, ,50 a 5, ,0 a 6, ,00 a, ,50 a, ,50 a, ,00 a, ,00 a, ,00 a, ,00 a, ,00 a 0, Spring steel (ASTM A22). Maximum temperature for EP, ES and CP 0 C / AP 00ºC. Vanadium-chrome steel (AISI 6150). Stainless steel (AISI 301). ASME code only applies to setted safety valves at 1,00 bar or above.

6 NPS 1 x NPS 2 API Orifice Letter do h h 1 h/do h 1 /do (1) WITH RAPID LIMITER (1) COEFFICIENT OF DISCHARGE 1 x 2 7,00 2,60 0, 0, x 2 9,00 3, 0, x 2 1/2 3 (2 x3 ) x,00,00 0, 0, 2 x 3 (3 x ) 0,00 1,00 5, 6,50 0,3 0, 0, 0,7 0,60 0,36 3 x ( x6 ) x 6 x ,00,00,00,00 0,36 0, 0, 0, 77 29,00,50 0,3 0, 6 x x D-E F G H J L N P Q T NPS 1 x NPS2 1 x ,0 19,0 0,33 0,1 2 56,15 27,90 0,36 0,1 0,7 API Orifice Letter do π. do Ao= 2. p [bar] SET PRESSURE IN bar I D-E 1 II III I x 2 F 31 x 2 1/2 G 91 I - Saturated steam in kg/h. II - Air at 0 C and 1,013 bar in [Nm3/h]. III - Water at C in l/h. II III I II III 1, , , , , , , , , Líquidos Vapor saturado Gases Vapor saturado Gases 6, αd αd αd 7, , , , , h d 0 h d 0 pa p 1,0, (1) d 0-63 (2) d 0 77 (3) d 0 1- (1) d 0-77 (2) d 0 1 (3) d 0 (1) d 0-1 (2) d 0 1,0, , , , , , , , , , , Calculated discharge capacities at set pressure +% overpressure. Discharge capacities at 2 bar and below are calculated at set pressure + bar of overpressure.

7 DISCHARGE CAPACITY x3 (2 x3 ) 2 x 3 (3 x ) 3 x ( x6 ) x 6 x 6 6 x x H J L N P Q T For other, not so dense liquids, other than water at C apply: V L = I II III I II III I II III I II III A L. V A ó V A = V L. L A V A = Water flow according to table. VL = Liquid flow. V A = Water density at C. (VA=99 Kg/m 3 ). V L = Liquid density. I II III I II III I II III Calculus according to ASME code section VIII Div.1

8 FACT LIST FOR SAFETY VALVE CALCULS Calculus according to ASME code section VIII Div.1 Consultation / Bid / Order Position N. N. of units Regulation Date: Department: Name: Fluid Calculation temperature C State at moment of dischar. l = liquid, s = steam, g = gas Molecular mass kg/kmol Adiabatic exponent æ Compressibility coe. Z Density at moment of discharge kg/m 3 Coefficients ψ max χ Viscosity cst cps Working pressure abs. bar Set pressure abs. bar External back pressure abs. constant variable bar Rated pressure abs. bar Discharge capacity Required: kg/h, Nm3/h, l/h Possible: 1) kg/h, Nm3/h, l/h Opening: Full lift / Normal / Progressive Manufacturer type Materials Manual discharge action yes / no Cover Closed / Open Bellows yes / no Body with drainage yes / no Diameter of narrowest flow d0 mm Section of narrowest Necessary A0 mm 2 flow A0 Allowed discharge coefficient Chosen A0 mm 2 αd Flange inch NPS Thread inch NPT Input / Output Welding (soldering) ends Unit weight Body Seat Plug Spring Joint Class Shape of joint surfaces (ASME/ANSI B.5-9) Certificate according to EN- 2.2 Certificate according to EN- 3.1 approx. kg Customer: Theme: Leaf: Of: l s g l s g l s g Informative brochure, without obligation and subject to our General Sales Conditions. Founded in Avenc del Daví, 22 Pol. Ind. Can Petit 0227 TERRASSA (Barcelona) SPAIN info@vycindustrial.com ENGSI936/1