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BT-RN

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Item	Description
1.1	Seal face
1.2	O-ring
1.3	Spring
2.1	Seat
2.2	O-ring

BT-RN

PDF data sheet

Features

For plain shafts
Single seal
Unbalanced
Conical spring rotating
Dependent on direction of rotation
Torque transmission via conical spring

Advantages

Universal application opportunities
Large choice of materials
No shaft damage from set screws
Dimensions can be adjusted and additional seats available
Variants with shrink fitted face available

Operating range

Shaft diameter:
d1 = 6 … 110 mm (0.24" … 4.33"),
Pressure: p1* = 10 (12) bar (145 (174) PSI)
Temperature: t* = -20 °C … +140 °C (-4 °F … +284 °F)
Sliding velocity: vg = 15 m/s (50 ft/s)

* Dependent on medium, size and material

Materials

Seal face:
CrNi steel (F, F1), CrNiMo steel (G), Tungsten carbide (U), Silicon carbide (Q1)

Seat:
Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Tungsten carbide (U), Silicon carbide (Q1)

Elastomers:
NBR (P), EPDM (E), FKM (V), FFKM (K)

Metal parts:
CrNi steel 1.4301 (F), CrNiMo steel 1.4401 (G)

Standards and approvals

Various material approvals e.g. WRAS, UBA, ACS, NSF, FDA available (depending on type and material combinations). Please inquire!
EN 12756

Recommended applications

Water and wastewater technology
Building services industry
Chemical industry
Food and Beverage industry
Low solid content media
Centrifugal pumps
Cooling water pumps
Clean water pumps

Notes

Alternative seat ring can be supplied with short tail or long tail with slot for pin (to prevent seat rotation).

Product variants

BT-RN.NU

Same items and designations as for BT-RN, but with installation length l1N according to EN 12756 (Normal, Unbalanced).

Item Description
1.1 Seal face
1.2 O-ring
1.3 Spring
A Spacer (upon request)
2.1 Seat
2.2 O-ring

BT-RN.KU

Items and designations same as for BT-RN, but with installation length l1K according to EN 12756 (Short, Unbalanced).

Item Description
1.1 Seal face
1.2 O-ring
1.3 Spring
2.1 Seat
2.2 O-ring

BT-RN40

Same items and designations as for BT-RN, but with shrink-fitted seal face into the seal face carrier.

Seal face:
Tungsten carbide (U), Silicon carbide (Q1)

Shaft diameter:
d1 = 16 … 80 mm (0.63" … 3.15"),

Item Description
1.1 Seal face
1.2 O-ring
1.3 Spring
2.1 Seat
2.2 O-ring

Similar products

AX25

External configuration
Balanced
Independent of direction of rotation
Independent of pressure direction

AX40K

Stationary springs
Balanced
Independent of direction of rotation
Independent of pressure direction

BT-C5E

Single seal
For plain shafts
Unbalanced
Multiple springs, rotating
Independent of direction of rotation

Back to overview

d1	d3	d4	d6	d7	l1	l3	l4	l5	l6
8	16	20	13.0	17.1	20.5	15	5.5	1.2	3
10	20	23	14.0	18.1	20.5	15	5.5	1.2	3
11	20	26	16.5	20.6	23.5	18	5.5	1.2	3
12	22	26	16.5	20.6	23.5	18	5.5	1.2	3
13	22	28	19.0	23.1	28.0	22	6.0	1.2	3
14	24	28	19.0	23.1	28.0	22	6.0	1.2	3
15	24	32	21.0	26.9	29.0	22	7.0	1.5	4
16	26	32	21.0	26.9	30.0	23	7.0	1.5	4
17	26	32	21.0	26.9	30.0	23	7.0	1.5	4
18	32	36	25.0	30.9	32.0	24	8.0	1.5	4
19	32	36	25.0	30.9	33.0	25	8.0	1.5	4
20	32	36	25.0	30.9	33.0	25	8.0	1.5	4
21	32	38	30.0	35.4	33.0	25	8.0	2.0	4
22	36	41	30.0	35.4	33.0	25	8.0	2.0	4
23	36	41	30.0	35.4	35.0	27	8.0	2.0	4
24	38	41	30.0	35.4	35.0	27	8.0	2.0	4
25	39	43	33.0	38.2	35.5	27	8.5	2.0	4
26	39	43	33.0	38.2	35.5	27	8.5	2.0	4
28	42	50	38.0	43.3	38.0	29	9.0	2.0	4
29	42	50	38.0	43.3	38.0	29	9.0	2.0	4
30	44	50	38.0	43.3	39.0	30	9.0	2.0	4
32	46	50	38.0	43.3	39.0	30	9.0	2.0	4
33	47	57	45.0	53.5	50.5	39	11.5	2.0	6
34	48	57	45.0	53.5	50.5	39	11.5	2.0	6
35	49	57	45.0	53.5	50.5	39	11.5	2.0	6
36	50	57	45.0	53.5	50.5	39	11.5	2.0	6
37	52	57	45.0	53.5	50.5	39	11.5	2.0	6
38	54	64	52.0	60.5	50.5	39	11.5	2.0	6
40	56	64	52.0	60.5	50.5	39	11.5	2.0	6
42	59	64	52.0	60.5	50.5	39	11.5	2.0	6
43	59	64	52.0	60.5	50.5	39	11.5	2.0	6
44	60	69	57.0	65.5	52.5	41	11.5	2.0	6
45	61	69	57.0	65.5	52.5	41	11.5	2.0	6
48	64	69	57.0	65.5	52.5	41	11.5	2.0	6
50	66	76	64.0	72.5	56.5	45	11.5	2.0	6
55	71	80	64.0	72.5	58.5	47	11.5	2.0	6
60	80	85	72.0	79.3	60.5	49	11.5	2.0	6
65	85	90	77.0	84.5	62.5	51	11.5	2.0	6
70	90	97	82.0	89.5	62.5	51	11.5	2.0	6
75	99	103	87.0	94.5	68.5	57	11.5	2.0	6
80	104	110	92.0	99.5	70.5	59	11.5	2.0	6
85	109	116	98.0	105.5	72.5	59	13.5	2.5	6
90	114	121	105.0	111.5	75.5	62	13.5	2.5	6
95	119	126	110.0	116.5	75.5	62	13.5	2.5	6
100	124	131	114.0	119.5	88.5	75	13.5	2.5	6
110	143	149	124.0	132.2	92.5	75	17.5	4.0	7

BT-RN / BT-RN4 - Dimensions in millimeters

d1	d3	d4	d6	d7	d8	l1NU	H	l1	l3	l4	l5	l6	l7	l1KU	l3
10	20	23	17	21	3	40	18	22	15	7	1.5	4	8.5	32.5	25.5
12	22	26	19	23	3	40	15	25	18	7	1.5	4	8.5	32.5	25.5
14	24	28	21	25	3	40	11	29	22	7	1.5	4	8.5	35.0	28.0
16	26	32	23	27	3	40	10	30	23	7	1.5	4	8.5	35.0	28.0
18	32	36	27	33	3	45	11	34	24	10	2.0	5	9.0	37.5	27.5
20	34	36	29	35	3	45	10	35	25	10	2.0	5	9.0	37.5	27.5
22	36	41	31	37	3	45	10	35	25	10	2.0	5	9.0	37.5	27.5
24	38	41	33	39	3	50	13	37	27	10	2.0	5	9.0	40.0	30.0
25	39	43	34	40	3	50	13	37	27	10	2.0	5	9.0	40.0	30.0
28	42	50	37	43	3	50	11	39	29	10	2.0	5	9.0	42.5	32.5
30	44	50	39	45	3	50	10	40	30	10	2.0	5	9.0	42.5	32.5
32	46	50	42	48	3	55	15	40	30	10	2.0	5	9.0	42.5	32.5
33	47	57	42	48	3	55	6	49	39	10	2.0	5	9.0	42.5	32.5
35	49	57	44	50	3	55	6	49	39	10	2.0	5	9.0	42.5	32.5
38	54	64	49	56	4	55	-	55	42	13	2.0	6	9.0	45.0	32.0
40	56	64	51	58	4	55	-	55	42	13	2.0	6	9.0	45.0	32.0
43	59	64	54	61	4	60	-	60	47	13	2.0	6	9.0	45.0	32.0
45	61	69	56	63	4	60	-	60	47	13	2.0	6	9.0	45.0	32.0
48	64	69	59	66	4	60	-	60	47	13	2.0	6	9.0	45.0	32.0
50	66	76	62	70	4	60	-	60	46	14	2.5	6	9.0	47.5	33.5
53	69	79	65	73	4	70	-	70	56	14	2.5	6	9.0	47.5	33.5
55	71	80	67	75	4	70	-	70	56	14	2.5	6	9.0	47.5	33.5
58	78	83	70	78	4	70	-	70	56	14	2.5	6	9.0	52.5	38.5
60	80	85	72	80	4	70	-	70	56	14	2.5	6	9.0	52.5	38.5
63	83	88	75	83	4	70	-	70	56	14	2.5	6	9.0	52.5	38.5
65	85	90	77	85	4	80	-	80	66	14	2.5	6	9.0	52.5	38.5
68	88	93	81	90	4	80	-	80	64	16	2.5	7	9.0	52.5	36.5
70	90	97	83	92	4	80	-	80	64	16	2.5	7	9.0	60.0	44.0
75	99	103	88	97	4	80	-	80	64	16	2.5	7	9.0	60.0	44.0
80	104	110	95	105	4	90	-	90	72	18	3.0	7	9.0	60.0	42.0
85	109	116	100	110	4	90	-	90	72	18	3.0	7	9.0	60.0	42.0
90	114	121	105	115	4	90	-	90	72	18	3.0	7	9.0	65.0	47.0
95	119	126	110	120	4	90	-	90	72	18	3.0	7	9.0	65.0	47.0
100	124	131	115	125	4	90	-	90	72	18	3.0	7	9.0	65.0	47.0

BT-RN.NU / BT-RN.KU - Dimensions in millimeters, l1NU complies with EN 12756 (normal length, unbalanced), l1KU complies with EN 12756 (short length, unbalanced)