HexaTech Robin Type (NOCH)

The Elastomer Bellows Mechanical Seal is a compact, unbalanced, single-spring mechanical seal engineered for general-purpose industrial and commercial rotating equipment. Featuring a flexible rubber bellows design, it provides non-clogging operation, self-aligning capabilities, and reliable shaft sealing without causing shaft fretting or wear.

Key Specifications & Features

Bellows Construction
Flexible elastomeric bellows eliminates sliding O-rings on the shaft, preventing shaft fretting and seal hang-up.
Spring Design
Single helical coil spring with pressed drive bands ensures uniform face loading and smooth torque transmission.
Direction of Rotation
Non-directional / bidirectional (independent of shaft rotation direction).
Self-Aligning Capability
Automatically compensates for minor shaft runout, axial float, and misalignments.

SEAL SIZE	ROTARY OD	ST OD	ROTARY LENGTH	ST.LE
14	26.4	28	18	7
15	26.4	28	18	7
16	26.4	32	19	8
17	28.5	32	19	8
18	29.5	35	19	8
19	29.5	35	19	8
20	31.6	38	20	8
22	33.6	40	20	8
25	39.6	44	20	9
28	45	46	21	9
30	46.6	50	22	9
32	46.6	54	24	9
35	50.8	58	26	10
38	54.3	60	27	10
40	57.3	64	28	10
45	61.3	66	30	10
50	67.8	72	32	10
MM/INCH		ROTARY OD	ST OD	ROTARY LENGTH	ST.LE NGTH
0.625	15.875	30	31.75	23.8	8.7
0.75	19.05	32.5	34.925	23.8	8.7
0.875	22.225	37.5	38.1	25.4	8.7
1	25.4	44	41.275	27	9.5
1.125	28.575	48	44.45	28.6	9.5
1.25	31.75	50	47.625	28.6	9.5
1.375	34.925	54.5	50.8	30.2	9.5
1.5	38.1	58.5	53.975	30.2	9.5
1.625	41.275	64	60.325	36.5	11.1
1.75	44.45	67	63.5	36.5	11.1
1.875	47.625	71	66.675	39.7	11.1
2	50.8	73.5	69.85	39.7	11.1

Specification:

No.	DESCRIPTION	MATERIAL
1	Cup Gasket	NBR / HNBR / VITON
2	Stationary ring	Alumina ceramic / SIC
3	Rotary ring	Graphite carbon / SIC
4	Retainer	SUS304
5	Bellows	NBR / HNBR / VITON
6	Drive ring	SUS304
7	Spring	SUS304
8	Spring seat	SUS304

Application:

PARAMETER	SPECIFICATION
Pressure	1MPa
Speed	12M/S
Temperature	-30°C ~ 200°C

HEXATECH TRADING CO.

Hexatech Trading Co. designs and manufactures high-performance mechanical seals and related products for diverse heavy and process industries worldwide.