1、.- MIL-V-2762B 48 7779706 0270355 T = MIL-V-2962B 20 October 1961 SUPERSEDING 27 September 1957 MIL-V- 2962A MILITARY SPECIFICATION VALVES, PRESSURE REGULATING, BOILER FUEL-OIL This specification has been approved by the Department of Defense and is mandatory for use by the Departments of the Army,
2、the Navy and the Air Force. 1. SCOPE 1.1 This specification covers boiler fuel-oil pressure regulating valves. 1.2 Classification. - Boiler fuel-oil pressure regulating valves shall be of the following classes as specified (see 6.1): Class 1 - 350 pounds per square inch gage Class 2 - 1000 psig desi
3、gn pressure. (psig) design pressure. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for bids, form a part of this specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-V-3 - Valves, Fittings, and Flanges (Except for Oxygen System
4、s Indi- cated Herein); Packag- ing of. MIL-P-116 - Preservation, Methods of. MIL-B-857 MIL-D-963 - Drawings, Electrical, Hull and Mechanical Equipment for Naval Shipboard Use. nated, Thermosetting, Sheets, Paper-Base, Phenolic-Resin. MIL-P-15024 - Plates, Identification- Information and Marking for
5、Identification of Elec- trical, Electronic and Mechanical Equipment. - Bolts, Nuts and Studs. MIL-P-3115 - Plastic-Material, Lami- MIL-H-15424 - Hand Tools, Packaging of. STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes. MIL-STD-129 - Marking for Shipment
6、and Storage. MIL-STD-278 - Welding and Allied Froc- esses for Machinery for Ships of the United States Navy. DRAWINGS BUREAU OF SHIPS B-153 - Packings and Gaskets, Standard Application for. (Copies of specifications, standards, drawings, and publications required by contractors in connec- tion with
7、specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. - The following docu- ments form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of i
8、nvitation for bids shall apply. AMERICAN SOCIETY OF MECHANICAL ENGINEERS SA-105 - Forged or Rolled Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High Temperature Serv- ice. SA-193 - Bolts. SA-194 - Nuts. SA-216 - Carbon Steel Castings. SA-276 - Steel Bars. SA-296 - Alloy Castings. SB
9、-143 - Bronze castings. SB-164 - Nickel-Copper Alloy Rods and Bars. (Application for copies should be addressed to the American Society of Mechanical Engineers, 29 West 39th St., New York, N. Y. ) NATIONAL BUREAU OF STANDARDS Handbook H28 - Screw Thread Standards for (Application for copies should b
10、e addressed to the Federal Services. Superintendent of Documents, Government Printing Office, Washington 25, D. C. ) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2762B Li8 777770b 0270356 L m MIL- V-2 9 62 B 3. REQUIREMENTS lightest possible
11、 consistent with the strength required 3.1 Preproduction. - Prior to production, one valve of each new flow design capacity at working in 4.2. for safety and reliability. 3.2.2 The materials, except as hereinafter speci- pressure be Ilbrnitted and tested as specified fied, shall conform to the manuf
12、acturers standards for the particular parts, and shall beas approved by the bureau or agency concerned. 3.2.3 The materials of the parts specified in table I shall as a minimum be selected from and conform to the requirements of the applicable docu- ments specified therein. 3.2 Materials. - 3.2.1 Ma
13、terials shall be of the quality best suited for the purpose intended. The material used in con- struction of the valves shall, in all cases, be the Table I - Materials, I- Body and bonnet Handle Bonnet gasket Packing Material Cast steel Forged steel Cast steel Forged steel Corrosion-resisting steel
14、Case corrosion-resisting steel Cold-rolled or cold-drawn steel Bronze Corrosion- resisting steel Case corrosion-resisting steel Nickel-copper Cast steel Forged steel Steel Compressed asbestos sheet Gasket, spiral wound metal, asbestos Gasket, metal case, asbestos, steel (maximum hardness 80 Brinell)
15、 Asbestos, high-pressure, rod Asbestos, square-braided, plain Flax, braided Flexirnetalic rod Plastic metallic, foil jacket Plastic metallic, copper base, class I class II Applicable documents Publication SA-216, grade WCB Publication SA-105, Erade II Publication SA - 2 16 Publication SA-105, grade
16、II Publication SA-276, classes 416 Publication SA-296, grade CF-8 and 420 Publication SB-143, alloy 2A Publication SB-143, classes 416 publication SA-296, CF-8 Publication SB-164, class A Publication SA-216 Publication SA-105, grade II Specification MIL-E-857 and 420 classes B and C; Publications SA
17、-193 and SA-194 Drawing B-153, symbol 2150 Drawing B-153, symbol 2410 Drawing B-153 Drawing B-153, symbol 1100 Drawing B-153, symbol 1103 Drawing B-153, symbol 1260 Drawing B-153, symbol 1430 Drawing B-153, symbol 1434 Drawing B-153, symbol 1108 3.3 Classes. - 3.3.2 Class 2. - Class 2 boiler fuel-oi
18、l pressure regulating valves shall be of the hand-operating type 3.3.1 Class 1. - Class 1 boiler fuel-oil pressure suitable for installation in the return oil line from the return header to the fuel-oil service anks in wide range return-flow fuel-oil burner applications. regulating valves shall be o
19、f the hand-operated type suitable for installation in the piping to the burner manifold (supply header) servicing straight mechani- cal burner atomizers. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2962B 3.4 Pressure control. - 3.4.1 Pres
20、sure control (class i). - Class 1 valves shall permit rapid and accurate control of discharge pressure between 50 and 290 psig with an inlet pressure of 300 psig. 3.4.2 Pressure control (class 2). - Class 2 valves shall permit rapid and accurate control of in- let pressure between 50 psig and 400 ps
21、ig with dis- charge pressure 40 psig or less. 3.5 Bypass.- 3.5.1 Class 1. - Class 1 valves shall have a by- pass arrangement which will operate only when the valve is in the “shut“ position. The bypass shall be incorporated internally into the valve. The bypass shall open only when the main valve po
22、rt is com- pletely closed, and shall be completely closed when the main port starts to open, in order that control of oil flow will not be affected by he bypass. The portion of travel in which the main valve port and bypass are closed shall be the smallest practicable and shall not in any case excee
23、d 2 degrees. The by- pass port shall be wide open after a travel of not more than 6 degrees from where the main port closes. 3.5.2 Class 2. - Class 2 valves shall not be equipped wih a bypass. 3.6 Flow characteristics. - 3. 6.1 Flow characteristics as specified in 3.6.1.1 ihrough 3.6.1.2.3 are based
24、 on idealized linear sprayer plate. Unless otherwise specified in the contract or order, the following shall be fur- nis hed: (a) Applicable sprayer plate capacity curves by the contracting officer or (b) The resistance characteristics of the sprayer plates shall be described by either of the follow
25、ing: (1) Contracting officer. (2) Philadelphia Naval Shipyard (Naval Boiler and Turbine Laboratory at the request of the contracting officer). The bidder shall design for linear changes in firing rate of burners with linear changes in operating lever position of the valves. 3.6.1.1 Class 1. - Class
26、1 valves shall be de- signed to provide the flow characteristics and pres- sure drops specified in 3.6.1.1.1 through 3.6.1.1. 6 (see 6.1). 3.6.1.1.1 The pressure drop through the class 1 valves shall be 10 psi, plus 2, minus 1 psi, when passing fuel-oil of 135 SSU viscosity, with an inlet pressure o
27、f 300 psi at a rate of flow equal to the design capacity of the valve as specified (see 6. i). 3. 6. 1. 1. 2 Starting from the full open position, with the flow conditions specified in 3. 6.1.2. 1, the class 1 valve shall produce, as nearly as practica- ble, a uniform and proportionate reduction in
28、1- ves- sure, with the movement of the operating lever to- ward the closed position in such a manner that the pressure drop will be 250 psi, with the operating lever in a position 20 to 30 percent of the rotation from the closed position. 3.6.1.1.3 Absolute tightness between the seat and disc is not
29、 required but the leakage past the seat shall not, in any case, exceed 60 pounds of water per hour with an inlet pressure of 300 psi and an atmos- pheric discharge pressure. 3. 6. 1.1.4 In order to provide adequate control of fuel-oil pressurc at “port“ firing rate, the valve shall produce a drop of
30、 50 psi, or more at a setting of the operating lever 15 percent of the rotation from the closed position when passing 4 percent of the design oil rate at 135 SSU viscosity and with an inlet pressure of 300 psi. 3.6.1.1.5 Starting from the setting, and with the flow conditions specified in 3. 6.1. 1.
31、4, the valve shall produce, as nearly as practicable a uniform and proportionate reduction in pressure with the movement of the operating lever to the shut-off point at approximately zero degree rotation. have a capacity of 1/2 the design capacity of the valve as specified (see 6.1) with a pressure
32、drop of 225 psi, + 10 psi, and with an inlet pressure of 300 psi. - 3.6. 1. 1.6 The bypass of class 1 valves shall 3.6.1.2 Class 2. - Class 2 valves shall be de- signed to provide the flow characteristics and pres- sure drops specified in 3.6.1.2.1 through 3.6.1.2.3 (see 6. 1). 3.6.1.2.1 The pressur
33、e drop through class 2 valve shall be 10 psi, plus 2 minus 1 psi, when pass- ing fuel oil of 135 SSU viscosity with an inlet pres- sure of 50 psi, at a rate of flow equal to the valve as specified (see 6.1). with flow conditions as specified in 3.6.1.1, the valve shall produce, as nearly as practica
34、ble, a linear increase in pressure drop with flow regulated nearly to shutoff, with linear angular movement of the operating lever toward the closed position in such a manner that the pressure drop in the closed posi- tion shall be 400 psi. 3. 6. 1.2.2 Starting from the full open position, 3 Provide
35、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-27b2B YB = 77777Ob 02703.58 5 W MIL-V- 2962B 3.6.1.2.3 Absolute tightness between the seat and disc is not required but the leakage past the seat shall not, in any case, exceed 60 pounds of water per hou
36、r with an inlet pressure of 300 psi and atmos- pheric discharge pressure. 3.7 Design pressure. - 3.7.1 Class 1 valves shall be designed for an operating pressure of 350 psig. 3.9 Dimensions. - The valve bodies shall be flanged. Unless otherwise specified in the contract or order the flanges shall be
37、 nonraised face with fine tool finished machined joint faces, and shall be fur- nished undrilled. Unless otherwise specified (see 6. i), the face-to-face dimensions of valves and flange dimensions shall be as specified in table II, and shall be suitable for the bolting indicated. 3.10 Dial indicator
38、. - In order to facilitate du- plication of previous valve settings. a dial indicator 3.7.2 Class 2 valves shall be designed for an chal1 be proiided. The dial shali be graduated in 2 degree increments, as a minimum and marked with the number of degrees every 10 degrees, over an arc extending from t
39、he closing point to the full open point of the valve. The dial may be made of. phenolic-material conforming to the requirements for type PBG of Specification MIL-P-3115. operating pressure of 1000 psig. 3.8 If the valves are of such design that flow through the valves is permissible in one direction
40、 only, an arrow indicating the direction of flow shali be cas on the valve body. Table II - Flange dimensions. Face-to- face of Size of .Inches Inches 1- 1/4 8-3/4 1- 1/2 10-1/4 Flange diameter Inches 5-3/8 5-15/16 6- 1/2 Flange thickness Number of bolts Inch 5/8 5 11/16 7 11/16 6 3.11 Provision sha
41、ll be made for setting the operating lever and the indicating scale in any one of at least six positions. 3.12 Bolts, bolt-studs and nuts. - Bolts, bolt- studs and nuts shall be threaded, UNC class 2 fit; studs shall be threaded, UNC class 2 fit on the nut end and class UNC 5 fit on the stud end. Mi
42、nimum standards of threading shall be in accordance with Handbook H28. 3.13 Marking. - All valve discs (including repair parts) and the indicating dials shall be stamped with the design capacity of the valve. In addition, when specified (see 6. i), the discs shall be stamped to indicate the intended
43、 use. 3.14 Welding. - All welding shall be in accord- ance with Standard MIL-STD-278. 3.15 Identification plates. - A suitable identi- fication plate shall be provided in accordance with Specification MIL-P- 15024, mounted under the fas- tening nut of the operating lever, engraved as speci- fied (se
44、e 6.1). Flange bolting Diameter of bolt holes Inch 11/16 11/16 . 11/16 Diameter of pitch circle Inches 4- 1/16 4-5/8 5-3/16 3.16 Repair parts and tools. - 3.16.1 Repair parts. - Unless otherwise speci- fied (see 6. i), one set of repair parts shall be sup- plied with the valves for each ship. This s
45、et shall consist of the following parts, the quantity of each to be 25 percent of the total number of valves being furnished for the particular ship: (a) Valve disc. (b) Valve seat (if removable). (c) Springs of each kind and size. 3.16.2 Tools. - Unless otherwise specified (see 6. i), one each of a
46、ll special tools required for assembly or for normal maintenance, repair and adjustment of the valves shall be furnished for each ship on which the valves are to be installed. No ordinary tools are required. Special tools are defined as those tools not listed in the Navy Stock List of General Stores
47、. (Copies of this stock list may be consulted in the office of the Government inspector. ) 3.17 Drawings. - Drawings shall be furnished in accordance with Specification MIL-D-963. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2962B i.I m 99
48、7970b O270359 7 W MIL-V-2962B 3.18 Workmanship. - Workmanship shall be first class in every respect. 4. QUALITY ASSURANCE PROVISIONS 4.1 The supplier is responsible for the perform- ance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his o
49、wn or any other inspection facilities and services acceptable to the Government. nspec- tion records of the examination and tests shall be kept complete and available to the Government as specified in the contract or order, The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemsd necessary to assure supplies and serv- ices conform to prescribed requirements. 4.2 Preproduction testing. - Preproduction testing of one valv
