Equivalent to:

● John Crane Type 680

Operating Limits:

● Temperature:-20℃ - +350℃

● Pressure：≤ 20bar

● Speed: ≤ 25m/s

● Shaft size: 0.75"- 6" / 18mm - 150mm

Materials:

● Seal Rings: A,B,Q1/12,Q2/22, U1/12,U2/22

● Elastomer: VITON, EPDM, NBR, FFKM, AFLAS

● Metal Part: SS304, SS316, 4J42, 2CR13, AM350, Hastelloy C, Inconel 718

Assembly Dwg:

Dimensions (mm):

Inch Size	Metric Size
D(inch)	D1	L	D(mm)	D1	L
0.750	1.312	1.250	18	32	27.5
0.875	1.437	1.250	20	33.3	27.5
0.937	1.500	1.250	22	36	27.5
1.000	1.562	1.250	24	38.1	30
1.125	1.687	1.250	25	39	30
1.250	1.812	1.312	28	42	32.5
1.375	1.937	1.437	30	44	32.5
1.500	2.062	1.437	32	46	32.5
1.625	2.187	1.437	33	47	32.5
1.750	2.312	1.437	35	49.2	32.5
1.875	2.437	1.500	38	52.4	34
2.000	2.562	1.500	40	55.6	34
2.125	2.687	1.500	43	58.7	34
2.250	2.812	1.562	45	58.7	34
2.375	2.937	1.562	48	61.9	34
2.500	3.187	1.562	50	65.1	34.5
2.625	3.312	1.625	53	68.3	34.5
2.750	3.437	1.625	55	71	34.5
2.875	3.625	1.687	60	74.6	39.5
3.000	3.750	1.687	65	84.1	39.5
3.125	3.875	1.750	70	87.3	45
3.250	4.000	1.750	75	95.3	45
3.375	4.125	1.750	80	98.4	44.5
3.500	4.250	1.875	85	104.8	44.5
3.625	4.375	1.875	90	108	49.5
3.750	4.5	1.875	95	114.3	49.5
3.875	4.625	1.875	100	120.7	49.5
4.000	4.75	1.875	105	131.7	48.3
4.250	5.187	1.903	110	138.1	48.3
4.500	5.437	1.903	115	144.5	48.3
4.750	5.687	1.903	120	144.5	48.3
5.000	5.937	1.903	125	150.8	48.3
5.250	6.213	1.903	130	157.8	48.3
5.500	6.463	1.903	140	170.5	48.3
5.750	6.714	1.903	150	176.9	48.3
6.000	6.964	1.903

*Related Introduction*

Precautions for the use of mechanical seals:

(1) When the temperature of the conveying medium is too high, too low, or contains impurity particles, is flammable, explosive, or toxic, corresponding measures such as sealing, washing, cooling, and filtering must be taken.

(2) Before operation, turn the car by hand, pay attention to whether the torque is too large, whether there is rubbing or abnormal sound.

(3) Pay attention to the direction of rotation, whether the coupling is centered, whether the lubricating oil at the bearing part is added properly, and whether the piping is correct.

(4) Before operation, first open the medium and cooling water valve, check whether the gas in the sealed cavity is completely discharged to prevent leakage caused by static pressure, and then start the operation.

(5) Whether the work is normal and stable after driving, whether there is abnormal torque caused by shaft rotation, abnormal noise and overheating.

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