B. Conical Seal Installation
CAUTION: DO NOT INSTALL CONICAL SEAL INTO TUBE NUTS. SEAL SHALL BE INSTALLED ON MALE FITTING ONLY.
(1)
Install conical seal onto male flare portion of plumbing fitting. Flats on conical seal are designed to provide proper positioning of seal onto plumbing fitting to prevent cocking of seal that could cause flow restriction.
(2)
Thread tube nut onto plumbing fitting several turns with fingers until joint is snug. If tube nut cannot be tightened snugly with fingers, disassemble and correct problem to prevent assembly damage to conical seal.
CAUTION: DO NOT INSTALL CONICAL SEAL INTO TUBE NUTS. INSTALL SEAL ON MALE FITTING ONLY.
(3)
Tighten tube nuts as follows:
NOTE: Conical seals are subject to cold creep; therefore, a double tightening procedures is required.
(a)
Tighten tube nuts to torque value specified in Table 502. Torque values are higher than torque values for tube nuts without conical seals installed.
(b)
Allow five minutes elapsed time for cold creep to occur.
(c)
Recheck torque on tube nut and, if required, further tighten to torque value specified in Table 502.
Assembly
Page 505
Apr 1/05
20-00-02/70-00-01
Table 502. Standard Torque Values for Flared Tubing Fittings Used with Conical Seals
Tube Conical Seal Torque (in.-lb), Torque (N-M) Dash No. Part Number All Steel Parts All Steel Parts
3 *VSF1015N3B 110 to 125 12.428328 to 14.1231 **651-525-9003
4 *VSF1015N4B 165 to 190 18.642492 to 21.467112 **651-525-9004
5 *VSF1015N5B 225 to 250 25.42158 to 28.2462 **651-525-9005
6 *VSF1015N6B 335 to 375 37.849908 to 42.3693 **651-525-9006
8 *VSF1015N8B 575 to 625 64.96626 to 70.6155 **651-525-9008
*Voi-Shan Division of VSI Corp, 8663 Higuera St, Culver City, CA 90230 **Responsible Honeywell Inc.
Assembly
Page 506 Apr 1/05 Copying, use or disclosure of information on this page is subject to proprietary restrictions.
20-00-02/70-00-01
4. Pressing Interference Fit Parts
CAUTION: DURING ASSEMBLY OF SOME UNITS, CLOSE TOLERANCE FITS REQUIRE THAT A PART WILL EITHER HAVE TO BE COLD SOAKED OR HEATED IN ORDER TO PERMIT ASSEMBLY WITHOUT DAMAGE TO PARTS.
A. Cold Soaking Loose Tolerance Fit Parts
(1)
Cold soak part in liquid nitrogen (Federal Specification BB-N-411) (SECTION VII) immediately prior to installation.
(2)
Install part as specified in applicable manual.
(3)
Allow joined parts to warm to room temperature before continuing with assembly procedures.
B. Heating Close Tolerance Fit Parts.
(1)
Heat part as specified in applicable manual prior to installation.
(2)
Install part as specified in applicable manual.
(3)
Allow joined parts to cool to room temperature before continuing with assembly procedures.
C. Press Fitting Assembly Parts Using an Arbor Press
CAUTION: REFER TO APPLICABLE MANUAL FOR PROPER TOOLING TO BE USED TO PREVENT DAMAGE TO PARTS.
(1)
Position parts to be joined, along with proper tooling, onto base of arbor press.
(2)
Align parts and carefully apply pressure to tooling to start mating process. When alignment is assured, press part to positional requirements specified in applicable manual.
D. Force Forming Gearshaft Assembly Retainer Rings
(1)
Assemble gearshaft assembly (typical) in accordance with applicable manual for unit in work.
(2)
Position gearshaft assembly on suitable swaging tool base.
(3)
Install suitable swaging tool over shaft of gearshaft assembly against retainer ring.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：标准施工手册 STANDARD PRACTICES MANUAL 20-00-02/70-00-01(105)
