OVON Live Loading Disc Spring

Brand: AIGI ENVIRONMENTAL INC
Type: AIGI LIVE Loading Disc Spring

The new OvOn™ bidirectional spring not only acts as a normal spring to compensate for load loss but also acts in the opposite direction to prevent over-compression of the gasket.

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♦ A constant challenge: “flange breathing”

Scenario I:	Pressure surge or sudden temperature increase especially when pipeline start	ScenarioII:	Pressure exit or sudden temperature decrease especially when pipeline shutdown
Mechanism:	Excessive pushing force from inside	Mechanism:	Excessive pulling force from inside
Result:	Load surge may yield bolts or crush gaskets	Result:	Bolt relaxation may cause gasket leakage

♦ Two Loading Curves

♦ Two design points

Inflection point A: From one foot standing to two feet standing, OvOn™ reaches standard bolt load required.

Max point B: From two feet standing to total flat, OvOn™ edges toward bolt yield strength.

Each Ovon™™ Spring has been precisely designed

OvOn™™ 17-7PH

OvOn™™ H13

Size	Recommended torque ((Nm plus/minus 10)%)	Preload (first stage) ((N plus/minus 10)%)	Bolt yield load (second stage) ((N plus/minus 10)%)
M10 (3/8″)	15	8369	11068
M12	28	12893	17275
1/2″ (12.7mm)	32	13943	18767
M14	44	17431	23665
M16 (5/8″)	65	22534	31004
M18	92	28293	39457
3/4″ (19.1mm)	108	31493	44235
M20	128	35495	50183
7/8″ (22.2mm)	170	42992	61632
M24	215	49703	72263
1″ (25.4mm)	249	54556	80115
M27	308	63398	94178
1 1/8″ (28.6mm)	358	69573	104544
M30	409	75679	114920
M32 (1 1/4″)	491	85942	132219
M33	544	91549	142179
M35 (1 3/8″)	650	103515	163140
M36	723	111577	177312
M39 (1 1/2″)	876	125723	204064
M42 (1 5/8″)	1090	144819	247226
M45 (1 3/4″)	1301	161568	275381
M48 (1 7/8″)	1594	185219	324009
2″ (50.8mm)	1867	204133	366439
M52	2010	214705	389509
M56 (2 1/4″)	2494	244861	462960
M64 (2 1/2″)	3378	293211	595131
M70 (2 3/4″)	4215	334915	722142
M72 (2 7/8″)	4587	351469	779036
M76 (3″)	5117	373572	861442
Applications: Applies to grade 8.8,A193-B7 or SAE 8 preload bolts Temperature range: -156 ~ 600°C Surface treatment: Oxidation for corrosion prevention Installation guide: Refer to STILL® installation video guide Both can be nickel plated against chloride-ion corrosion in chemical environment.

Size	Recommended torque ((Nm plus/minus 10)%)	Preload (first stage) ((N plus/minus 10)%)	Bolt yield load (second stage) ((N plus/minus 10)%)
M10 (3/8″)	38	21237	38334
M12	71	33032	59661
1/2″ (12.7mm)	82	35844	64752
M14	114	45098	81500
M16 (5/8″)	170	58882	106472
M18	242	74679	135116
3/4″ (19.1mm)	287	83572	151251
M20	341	94654	171356
7/8″ (22.2mm)	459	115849	209851
M24	585	135362	245343
1″ (25.4mm)	684	149703	271452
M27	853	175493	318369
1 1/8″ (28.6mm)	999	194273	352606
M30	1150	213023	386805
M32 (1 1/4″)	1396	244336	443901
M33	1557	262163	476472
M35 (1 3/8″)	1885	299794	545187
M36	2107	325217	591618
M39 (1 1/2″)	2512	360544	656314
M42 (1 5/8″)	3291	437436	797211
M45 (1 3/4″)	4003	497276	907113
M48 (1 7/8″)	5007	581834	1062414
2″ (50.8mm)	5984	654466	1196200
M52	6497	694149	1269228
M56 (2 1/4″)	8332	818159	1498239
M58	9023	864266	1583424
M64 (2 1/2″)	11950	1037367	1904419
M70 (2 3/4″)	15668	1244844	2289984
M72 (2 7/8″)	17443	1336364	2460567
M76 (3″)	20104	1467673	2705768
M80 (3 1/8″)	23358	1622084	2994616
M82 (3 1/4″)	25259	1705597	3151389
M85 (3 3/8″)	27867	1821362	3368635
M90 (3 1/2″)	32278	1999147	3703888
M95 (3 3/4″)	38454	2245805	4169391
M100 (4″)	45406	2505335	4656319
Applications: Applies to grade 8.8,A193-B7 or SAE 8 preload bolts Temperature range: -156 ~ 600°C Surface treatment: Oxidation for corrosion prevention Installation guide: Refer to STILL® installation video guide

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