Dynamic O-Ring Sealing

Transcription

1 Handbook lands for Industrial eciprocating Seals Design Chart 5-2 provides a reasonable basis for calculating reciprocating O-ring seal glands. Design Table 5-2, which follows it, contains recommended gland dimensions for the standard AS568A O-ring sizes. The major difference from the military gland dimensions (Design Table 5-1) is the use of standard cylinder bore and standard rod dimensions. Although these dimensions are suitable for most reciprocating designs, it is often desirable, or even necessary, deviate from them. Other portions of this handbook on Basic Elasmers (Section II) and Applications (Section III) are helpful in determining when such special designs are indicated and provide useful data for such modified designs. Procedures for using Design Table 5-2 are outlined in Design uide 5-2. See Section X, Table 10-6 for installation guidelines. land for Industrial eciprocating Seals Diameter (od land) Tolerance for all sizes + for sizes for sizes Diameter (Pisn) Tolerance for all sizes - for sizes for sizes Design uide 5-2a: land for Industrial eciprocating Seals uide for Design Table 5-2 If Desired Dimension is Known for Select Closest Dimension in Column ead Horizontally in Column To Determine Dimension for Bore Dia of cylinder A B-1 C Dia of pisn OD of pisn width OD of pisn C A B-1 Bore Dia of cylinder Dia of pisn width OD of rod B A-1 D Dia for rod Bore ID for rod width Bore Dia for rod D A-1 B Dia for rod OD of rod width Design uide 5-2b: uide For Design Table 5-2 After selecting gland dimensions, read horizontally determine proper O-ring size number. Specify compound. Industrial eciprocating Packing lands 2- AS568A Cross-Section Nominal Actual.070 1/ ± 3/32 1/8 3/ 1/4.103 ±.139 ± ±.275 ±.006 land Squeeze Actual % E(a) Diametral Clearance No ing() idth One ing( 1) Two ings( 2) (a) Clearance (extrusion gap) must be held a minimum consistent with design requirements for temperature range variation. (b) Total indicar reading between groove and adjacent bearing surface. Design Chart 5-2-a: Design Chart for Industrial eciprocating Packing lands adius Max. Eccentricity (b) Palumbo Drive, exingn, KY 40509

2 X Handbook Industrial eciprocating Packing lands Pisn land od land land Detail 0 5 Break Corners (Typ.) Approx. ad. 1/2E 32 X F land F (ef.) Surface Finish X: 32 ithout ing 63 ith ing Finishes are MS values I.D. B-1 Pisn Dia. (B-1 Min. = A Max. 2 Max.) B od O.D. C Pisn O.D. D od Bore Dia. A Cylinder Bore Dia. A-1 od land I.D. (A-1 Max. = B Min. + 2 Max.) Typ. Section - Typ. No ing 1 One ing efer Design Chart 5-2 (below) and Design Table 5-2 for dimensions. 2 Two ings Industrial Dynamic Metric Cross-Sections Cross-Section Industrial Dynamic Metric Cross-Sections land -rove idth No ing () adius (a) are in mm. The ISO/DIN recommendations are preferred. (b) s are not available in standard for metric sizes. Design Chart 5-2-b: Design Chart for Industrial Dynamic Metric Cross-Sections 2360 Palumbo Drive, exingn, KY

3 Handbook land for Industrial eciprocating Seals, Bar (1500 psi) Max. Bore Dia. OD Bore Dia. idth (Cylinder) OD (od) (Pisn) (od) Mean I.D. ± O.D. (ef) * * * * ± * * * * * * * * * * ± * * * * * * ± No. 2- A A-1 B B-1 C D Dia. (od Dia. land) *(Pisn) * These designs require considerable installation stretch. If assembly breakage is incurred use a compound having higher elongation or use a two-piece pisn. This groove width does not permit the use of rings. For pressures above Bar (1500 psi), consult Design Chart 5-2 for groove widths where rings must be used. Design Table 5-2: land for Industrial eciprocating Seals, Bar (1500 psi) Max Palumbo Drive, exingn, KY 40509

4 Handbook land for Industrial eciprocating Seals, Bar (1500 psi) Max. (Continued) A A-1 B B-1 C D Bore Dia. Dia. (od Dia. OD Bore Dia. idth (Cylinder) land) OD (od) *(Pisn) (Pisn) (od) Mean No. 2- I.D. ± O.D. (ef) * * * ± * These designs require considerable installation stretch. If assembly breakage is incurred use a compound having higher elongation or use a two-piece pisn. This groove width does not permit the use of rings. For pressures above Bar (1500 psi), consult Design Chart 5-2 for groove widths where rings must be used. Design Table 5-2: land for Industrial eciprocating Seals, Bar (1500 psi) Max Palumbo Drive, exingn, KY

5 Handbook land for Industrial eciprocating Seals, Bar (1500 psi) Max. (Continued) A A-1 B B-1 C D Bore Dia. Dia. (od Dia. OD Bore Dia. idth (Cylinder) land) OD (od) *(Pisn) (Pisn) (od) Mean No. 2- I.D. ± O.D. (ef) ± * These designs require considerable installation stretch. If assembly breakage is incurred use a compound having higher elongation or use a two-piece pisn. This groove width does not permit the use of rings. For pressures above Bar (1500 psi), consult Design Chart 5-2 for groove widths where rings must be used. Design Table 5-2: land for Industrial eciprocating Seals, Bar (1500 psi) Max Palumbo Drive, exingn, KY 40509