1、MIL-V-24384B 48 W 9799906 0274823 O E -31 -07 I INCH-POUND I MIL-V-24384B (SH) 17 February 1988 SUPERSEDING MIL-V-24384A(SHIPS) 26 April 1971 (See 6.7) MILITARY SPEGIFICATION VALVES, PRESSURE REGULATING, FOR LOW PRESSURE AIR OR NITROGEN SYSTEMS This specification is approved for use within the Naval
2、 Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers self-contained pressure regulating valves with a nominal pressure rating of 150 pounds per square inch (lb/in2) gauge for
3、 service in low pressure air or nitrogen systems. 1.2 Classification. Pressure regulating valves shall be of the following types, classes, and designs, as specified (see 6.2.1): Type I - Pressure reducing Type II - Back pressure regulating Type III - Priority Class A - Spring loaded Class B - Gas do
4、me loaded Class C - Internal pilot operated Design A - Unbalanced Design B - Balanced 1.2.1 Selection. Unless otherwise specified (see 6-2.1) the contractor shall select the class and design of valve best suited to meet the service con- ditions specified (see 6.2.1). application shall be chosen. The
5、 most simple construction suitable for each r . THIS DOCUMENT CONTAINS 14- PAGES. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of th
6、e Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 4820 AMCC NIA DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited Provided by IHSNot for ResaleN
7、o reproduction or networking permitted without license from IHS-,-,-MIL-V-24384B 48 W 7777906 027482Z 2 2. APPLICABLE DOCUMENTS 2,L Government documents 2.1.1 Specifications and standards. The following specifications and standards form a part of this specification to the extent specified herein. Un
8、less otherwise specified, the- issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation, SPECIFICATIONS FEDERAL QQ-N-2 8 1 - Nickel-Copper Alloy Bar, Rod, Plate, Sheet, S
9、trip, Wire, Forgings, and Structural and Special Shaped Sections. (UNS N05500) QQ-N-28 6 - Nickel-Copper-Aluminum Alloy, Wrought MILITARY MIL-S-901 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for. MIL-F-1183 - Fittings, Pipe, Cast Bronze, Silver-Brazin
10、g, General Specification for. STANDARDS FEDERAL FED-STD-HB8 - Screw-Thread Standards for Federal Services. MILITARY MIL-STD-167-1 - Mechanical Vibration of Shipboard Equipment, (Type I- Environmental and Type II- Internally Excited). 2.2 Other publications. The following document forms a part of thi
11、s speciication to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted shall be those listed in the issue of the DoDISS specified in the solicitation, issues of documents not listed in the DoDISS shall be the issue of the nongovern- ment document
12、s which is current on the date of the solicitation. Unless otherwise specified, the UNIFORM CLASSIFICATION COMMITTEE AGENT Uniform Freight Classfication Ratings, Rules and Regulations (Application for copies should be addressed to the Uniform Classification Committee Agent, Tariff Publication Office
13、r, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606,) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2438LIB 48 9999906 0274823 LI Body, gas dome or spring housing, and bottom cap Springs (Nongovernment standards and other publications
14、are normally available from the organizations which prepare or which distribute the documents. These documents also may be available in or through libraries or other informational services.) Valve bronze, nickel-aluminum bronze, copper-nickel, CRES Phosphor bronze, CRES, cadmium plated steel, nickel
15、-copper- iron alloy, QQ-N-281 or QQ-N-286 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, Specification sheets or MS standards), the text of this speci- fication shall take preced
16、ence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained . Valve poppet, seat ring, stem, guides, and other internal trim 3. REQUIREMENTS CRES, bronze, nickel-aluminum- bronze, QQ-N-281 or QQ-N-286 s 3.1 First article
17、. When specified in the contract or purchase order, a sample shall be subjected to first article inspection (see 4.3 and 6.3). * I 3.3 Construction. 3.2 Materials. Materials shall be as specified in table I. Materials shall be suitable for the intended pressure and shall be selected to prevent galli
18、ng, seizing, or excessive wear between parts. This specification is not intended to be restrictive, providing proposed alternate materials will provide satisfactory service. Naval Sea Systems Command (NAVSEA) approval is required for the use of any alternate material. TABLE I. List of materials. I M
19、aterial I Name of parts I 3.2.1 Recovered materials. Unless otherwise specified herein, all equip- ment, material, and articles incorporated in the products covered by this speci- fication shall be new and may be fabricated using materials produced from recovered materials to the maximum extent prac
20、ticable without jeopardizing the intended use. The term “recovered materials“ means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use o
21、f used or rebuilt products is allowed under this specification unless otherwise specifically specified. 3.3.1 General. Internal trim shall be readily replaceable without requiring removal of the valve body from the line. These valves will be operated, main- tained, and repaired on board Navy ships a
22、nd attention is directed to the fact 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24384B 48-1 9999906 0274824 b 6 I-IIL-V-2 4 3 8 4B ( SH ) that these valves will often operate under unfavorable contamination conditions, w!,ll sperate for
23、long periods of time unattended, and that maintenance personnel nay not be experienced mechanics. city, maintainability, ruggedness, and reliability, as defined in 3.3.1.1 Therefore, emphasis shall be placed on simpli- through 3 3.1 4 e . Valves shall be constructed with the least separate parts and
24、 least dynariiic seals consistent with satisfactory performance. Lhe valve s1ial:l require no adjustments during or after assembly, other than the set point adjusLmenL. 3.3.1.2 1-aintainability. Internal parts shall be constructed to permit easy disassembly and reassembly with standard tools and to
25、prevent, as far as practicd., the ncosrecl: renssenibly of parts . Positioning and alignment of all parts in assembly shall employ positivr3 mans so that correct reassembly is repeatedly assured. interchangeable or reversible unless such parts are also interchangeable or reversible with regard to fu
26、nction, performance und strength. In no case shall parts for a given vulve be physicallly To the maximum extent practical, valves shall be constructed LO tolerate and not be easily subJect to damage, malfunction, or lealsage resulting from foreign particle and other line media contamination or from
27、nishandling. fvaly fine clearances or Einiches. Valves shall- tolerate particulate contamina- tion up to 40 inicrometers in size. Therefore, valves shall not incorporate or rely upon excess- 3.3.1.4 Reliability. Valves shall operate satisfactorily for extended periods of time with minfnum need for m
28、aintenance, hbrication, or act justment , when subjected LO the conditions norinally associated with shipboard sorvlce. Valves shall not require maintenance or lubrication at intervals shorter than 1 year, under continuous use on shipboard applications. 3.3.2 Pressure envelo_lo. The design and test
29、pressures for the pressure containing envelope (body, gas dome or spring housing, and bottom cap) shall be as follows: (a) Nominal. pressure rating - 150 lb/in2 gauge. (b) Design temperature - 165 degrees Fahrenheit (OE). (e) Proof pressure - 225 lb/in2 gauge. (d) Burst pressura - 450 lb/in2 gauge.
30、3,3.3 Internal trim. The poppet or plug guiding surfaces (bushings and posts) shall have the proper hardness, finish, concentricity, parallelism, clearances, leiigch and rigidity to prevent binding or seizing and to ensure proper seating under all operating conditions. shall. be maintained with inte
31、rchangeable parts 3nd under any tolerance stack-up condition. A nonaetallis seating feature shall be incorporated in either the poppet or seat: and shall be readily replaceable on all sizes. Che guide posts and bushings shal.1 be 32 roughness height rating (RHR) or better. These alignment requiremen
32、ts The finish on 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24384B 48 7777706 0274825 8 3.3.4 - Body. Valves shall be of basic globe configuration with inline inlet and outlet ports. Pressure lines, including the reduced pressure sensing
33、 line, gas dome loading line, and poppet balance line, where applicable, shall be internally ported in the body. The construction shall be such as to prevent direct high velocity impingement of the flow issuing from the throttling orifice onto the sensing element. The bonnet or spring housing and bo
34、ttom cap shall be attached to the body with bolted flanges or threaded connection. Bearing surfaces of nuts and bolts and their respective mating surfaces on the valve shall be finished machined if not cast or forged smooth and true. 3.3.5 Interchangeability. All parts having the same manufacturers
35、part number shall be directly interchangeable with each other with respect: to installation and performance without requiring selection or fitting. 3.3.6 Springs. Springs shall be constructed so that they will not be cornpressed solid during any operation of the valve. Spring ends shall be squared a
36、nd ground. When removed from the valve and compressed solid, the spring shall not exhibit a permanent set exceeding 0.010 inch per inch of spring length, measured 10 minutes after release of the spring. 3.3.7 Threads. Threads shall conform to FED-STD-H28. Where necessary, provisions shall be incorpo
37、rated to prevent the accidental loosening of threaded parts. Pipe threads shall not be used. The construction shall be such that standard wrenches can be used on all external bolting. 3.3.8 Set pressure adjustment. Means shall be provided for adjusting the set pressure through a range of at least 75
38、 to 125 percent of the specified set pressure (see 6.2.1), with the valve under pressure. device shall be safeguarded against accidental change in the set pressure. The adjusting or loading 3.3.9 End connections. Inlet and outlet connections shall be union end in accordance with MIL-F-1183. Union nu
39、ts and tail pieces shall be furnished with the valve. 3.4 Performance requirements. Valves shall operate smoothly without instability and shall meet the requirements of 3.4.1 through 3.4.6. 3.4.1 Accuracy of regulation (see 6.4.2(b), type I valves. 3.4.1.1 Flow-droop. Unless otherwise specified in t
40、he contract or order (see 6.2.1), the valve shall maintain the delivered pressure within the limits of plus or minus 5 percent or plus or minus 2 lb/in2, whichever is greater, when the flow demand is varied between lock-up and the full flow rating of the valve and with a constant inlet pressure of 1
41、50 lb/in2 gauge. 3.4.1.2 Set pressure shift. The ratio of set pressure shift to inlet pressure shift shall not exceed 1:20 for design A valves and 1:lOO for design B valves. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24384B 48 99974Ob 02
42、748Zb T 3.4.3 Performance - type III valves. 3.4.1.5 Seat tightness. With 150 lb/in2 gauge at the inlet and the down- stream pressure at lockup (see 6.4.2(d), leakage from the inlet to outlet portion of the valve shall not exceed 15 standard cubic inches per hour (in3/hr) pet. inch of seat diameter.
43、 pressure buildup in a known volume over a given period of time. and time for this test shall be chosen so that a pressure buildup of not more than 1 or 2 percent is required to indicate excessive leakage. This requirement may be checked by measuring the The volume 3.4.2 3.4.2.1 Accumulation-blowdow
44、n. The valve shall pass rated flow when the Perormance - type 11 valves. inlet pressure is increased to the accumulation pressure and shall reseat tightly (no leakage) when the inlet pressure is reduced to the blowdown (reseat) pressure. total band between the accumulation and blowdown pressure shal
45、l not exceed 10 percent: o the set pressure or 4 lb/in2, whichever is greater. shall respond essentially to the inlet pressure only and outlet pressures up to 85 percent: (or higher when so specified) of the inlet pressure shall have no efact on the ability of Lhe valve to strobe and remain fully op
46、en in response to inlet conditions. Unless otherwise specified in the contract or order (see 6.2.1), the Type II valves 3.4.2.2 Set pressure shift. The ratio of set pressure shift to outlet pressure shift shall not exceed 1:20 for design A valves and 1:lOO for design 13 valves. 3.4.2.3 Seat tightnes
47、s. With the inlet pressure reduced to the reseat (blowdown) pressure, there shall be no visible leakage (using bubble fluid or submerging the outlet, or a line from the outlet under water) from the inlet to outlet when checked over a 2-minute period. 3.4.3.1 Range of regulation. The band between set
48、 pressure and full open At any inlet pressure at or below the set pressura shall not exceed 15 lb/in2. pressure, the valve shall always be completely shutoff. aE or above the full open pressure, the valve shall always be fully open. At any inlet pressure 3.4.3.2 Capacity rating. The valve shall be s
49、ized so that when fully open, (that is, with an inlet pressure at or above the full open pressure) it shall pass rated Elow (that is, the required system flow) with a pressure drop across the valve not exceeding 5 lb/in2. specified in the contract or order (see 6.2.1), the inlet pressure for this condition shall be taken as 150 lb/in2 gauge. pressure drop at lower inlet pressures (but still at or above the full open pressure) will be greater and can be determined by the followin
