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BT-C7

Click image to enlarge

Item	Description
1.1	Seal face
2.1	Stationary seat
1.2, 2.2	O-Ring
1.3	Spring
1.4	Driver
1.5	Set screw

BT-C7

PDF data sheet

Features

Single seal
For plain shafts
Unbalanced
Super-sinus spring rotating
Independent of direction of rotation

Advantages

Universal application opportunities
Robust design
Insensitive to low solid content
Torque transmission by set screws
Variants with shrink fitted face available

Operating range

Shaft diameter:
d1 = 16 … 100 mm (0.63" … 3.94")
Pressure: p1* = 12 bar (16 bar) (174 PSI)
Temperature:
t* = -20 °C … +140 °C (-4 °F … +284 °F)
Sliding velocity: vg = 20 m/s (66 ft/s)

* Dependent on medium, size and material

Materials

Seal face
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:
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
Chemical industry
Process industry
Building services industry
Low solid content media
Centrifugal pumps
Multistage pumps
Cooling water pumps

Notes

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

Product variants

https://media-assets.eagleburgmann.com/image/108134910297/image_f04trqq26h5ul95ojju4vaa42d/-FWEBP

BT-C74

Items and designations are the same as for BT-C7, but with a shrink-fitted seal face into the seal face carrier.
Seal face: Tungsten carbide (U), Silicon carbide (Q1)

Item Description
1.1 Seal face housing
2.1 Stationary seat
1.2, 2.2 O-ring
1.3 Spring
1.4 Driver
1.5 Set screw

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	d₈	l_1KU	l₃	l₄	l₅	l₆	l₇
12	22	26	19	23	3	32.5	25.5	7	1.5	4	8.5
14	24	28	21	25	3	35.0	28.0	7	1.5	4	8.5
16	26	32	23	27	3	35.0	28.0	7	1.5	4	8.5
18	32	36	27	33	3	37.5	27.5	10	2.0	5	9.0
20	34	37	29	35	3	37.5	27.5	10	2.0	5	9.0
22	36	41	31	37	3	37.5	27.5	10	2.0	5	9.0
24	38	41	33	39	3	40.0	30.0	10	2.0	5	9.0
25	39	43	34	40	3	40.0	30.0	10	2.0	5	9.0
28	42	50	37	43	3	42.5	32.5	10	2.0	5	9.0
30	44	50	39	45	3	42.5	32.5	10	2.0	5	9.0
32	46	50	42	48	3	42.5	32.5	10	2.0	5	9.0
33	47	57	42	48	3	42.5	32.5	10	2.0	5	9.0
35	49	57	44	50	4	42.5	32.5	10	2.0	5	9.0
38	54	64	49	56	4	45.0	32.0	13	2.0	6	9.0
40	56	64	51	58	4	45.0	32.0	13	2.0	6	9.0
43	59	64	54	61	4	45.0	32.0	13	2.0	6	9.0
45	62	69	56	63	4	45.0	32.0	13	2.0	6	9.0
48	64	69	59	66	4	45.0	32.0	13	2.0	6	9.0
50	66	76	62	70	4	47.5	33.5	14	2.5	6	9.0
53	69	78	65	73	4	47.5	33.5	14	2.5	6	9.0
55	71	80	67	75	4	47.5	33.5	14	2.5	6	9.0
58	78	83	70	78	4	52.5	38.5	14	2.5	6	9.0
60	80	85	72	80	4	52.5	38.5	14	2.5	6	9.0
63	83	88	75	83	4	52.5	38.5	14	2.5	6	9.0
65	85	90	77	85	4	52.5	38.5	14	2.5	6	9.0
68	88	93	81	90	4	52.5	36.5	16	2.5	7	9.0
70	90	97	83	92	4	60.0	44.0	16	2.5	7	9.0
75	99	103	88	97	4	60.0	44.0	16	2.5	7	9.0
80	104	110	95	105	4	60.0	42.0	18	3.0	7	9.0
85	109	116	100	110	4	60.0	42.0	18	3.0	7	9.0
90	114	121	105	115	4	65.0	47.0	18	3.0	7	9.0
95	119	126	110	120	4	65.0	47.0	18	3.0	7	9.0
100	124	131	115	125	4	65.0	47.0	18	3.0	7	9.0

l~1KU~ complies with EN 12756 (short length, unbalanced) **BT-C7** - Dimensions in millimeter