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Mechanical Seal TB491 Replace Burgmann and John Crane

Name: Mechanical Seal TB491 Replace Burgmann and John Crane
Brand: TOPBON Mechanical Seal Manufacturer
SKU: 18297920
Rating: 4.75 (10 reviews)

Categories	Multi Spring Mechanical Seal
Trademark/Brand	TOPBON Mechanical Seal Manufacturer
Model	TB491
Temperature	-20℃-180℃
Speed	≦15m/s
Pressure	≦2.5MPA
Rotary Ring Material	CAR/SIC/TC
Stationary Ring Material	CER/SIC/TC
O-Ring Material	VIT/NBR/EPDM
Spring & Metal Parts	SUS304/SUS316
Application	Clean Water，Sewage Water，Oil
FOB port	ningbo
Terms of Payment	T/T
Update Time	Nov 15,2025

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Detail Information

Product Introduction

Product Size

Product Details

Product Model

TB491 mechanical seal

Replace Burgmann and John Crane

Operational Conditions:

Temperature：-20℃ to +180℃

Pressure： ≤2.5MPa

Speed： ≤15m/s

Materials:

Stationary Ring: Silicon Carbide, TC, Carbon

Rotary Ring: Silicon Carbide, Ceramic, TC

Secondary Seal: NBR, EPDM, Viton

Spring and Metal Parts: SUS304,SUS316

Applications:

Clean water,

sewage water

oil and other moderately corrosive fluids

Stationary Seat:

Standard:

Alternative:

Product details

SIZE

Size/ Metric	d	D1	D2	D3	L1	L2
18	18	33	27	32.28	30	7.5
20	20	35	29	34.29	30	7.5
22	22	37	31	36.30	30	7.5
24	24	39	33	38.30	30	7.5
25	25	40	34	39.29	30	7.5
28	28	43	37	42.29	35	7.5
30	30	45	39	44.30	35	7.5
32	32	48	42	46.30	35	7.5
33	33	48	42	47.90	35	7.5
35	35	50	44	49.48	35	7.5
38	38	56	49	54.28	35	9
40	40	58	51	56.08	35	9
43	43	61	54	59.08	35	9
45	45	63	56	61.09	35	9
48	48	66	59	64.11	35	9
50	50	70	62	66.09	35	9.5
53	53	73	65	71.00	35	11
55	55	75	67	71.07	35	11
60	60	80	72	77.14	35	11
65	65	85	77	83.01	35	11
68	68	90	81	91.00	35	11.3
70	70	92	83	86.08	35	11.3
75	75	97	88	98.43	48	11.3
80	80	105	95	104.79	48	12
85	85	110	100	107.95	48	12
90	90	115	105	114.30	48	14
100	100	125	115	123.83	48	14

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