Mechanical seals

MDH

Description:

- Double seal
- Unbalanced
- With spring set
- Rotation direction independent

Applications:

MDH is used in vertical shaft small and medium size mixing machines. Pumps transporting aggressive liquids with or without particles. This seal is applicable when septal fluid is used in the sealing chamber which separates the main fluid and cools the friction pair. To function properly it is necessary the pressure in the septal chamber to be higher then the main fluid's pressure. Its construction allows for a variety of friction pairs to be used and is repair-friendly. For liquids containing mechanical particles friction pair is of Tungsten carbide (TC) or Silicone carbide (SiC).

Parts and materials:

1. Elastomers (O-rings/muffs): NBR, EPDM, FPM (VITON), PTFE

2, 8. Seat:
A - Graphite antimony impregnated,
B - Graphite resins impregnated,
G - Stainless steel DIN 1.4571,
T - Inconel DIN 2.4856,
V - Aluminium oxide (Al2O3),
U - Tungsten carbide (TC),
Q - Silicone carbide (SiC)

3. Seal face:
A - Graphite antimony impregnated,
B - Graphite resins impregnated,
T - Inconel DIN 2.4856,
U - Tungsten carbide (TC),
Q - Silicone carbide (SiC)

4, 5, 6, 9. Metal parts: steel AISI304, AISI316

Operating conditions:

d1 (shaft diameter): from 20 to 200 mm
P max (max pressure): 20 bar
Temperature range: from -30 to +240°C
V max (max velocity): 20 m/s

Models and sizes [mm]:

Custom dimensions and seat configurations can be produced on request.

Model	d₁	d₃	d₆	d₇	L₁	L₈	L₉	M
MDH-18	18	33	27	33	38	19.5	11.5	M5
MDH-20	20	35	29	35	38	19.5	11.5	M5
MDH-22	22	37	31	37	38	19.5	11.5	M5
MDH-24	24	39	33	39	38	19.5	11.5	M5
MDH-25	25	40	34	40	38	19.5	11.5	M5
MDH-28	28	43	37	43	39	19.5	11.5	M6
MDH-30	30	45	39	45	39	19.5	11.5	M6
MDH-32	32	47	42	48	39	19.5	11.5	M6
MDH-33	33	48	42	48	39	19.5	11.5	M6
MDH-35	35	50	44	50	39	19.5	11.5	M6
MDH-38	38	55	49	56	41	22	14	M6
MDH-40	40	57	51	58	42	22	14	M6
MDH-43	43	60	54	61	42	22	14	M6
MDH-45	45	62	56	63	42	22	14	M6
MDH-48	48	65	59	66	42	22	14	M6
MDH-50	50	67	62	70	43	23	15	M6
MDH-53	53	70	65	73	43	23	15	M6
MDH-55	55	72	67	75	43	23	15	M8
MDH-58	58	79	70	78	56	23	15	M8
MDH-60	60	81	72	80	56	23	15	M8
MDH-63	63	84	75	83	55	23	15	M8
MDH-65	65	86	77	85	55	23	15	M8
MDH-68	68	89	81	90	55	26	18	M8
MDH-70	70	91	83	92	56	26	18	M8
MDH-75	75	99	88	97	56	26	18	M8
MDH-80	80	104	95	105	56	26.2	18.2	M8
MDH-85	85	109	100	110	56	26.2	18.2	M8
MDH-90	90	114	105	115	56	26.2	18.2	M8
MDH-95	95	119	110	120	56	25.2	17.2	M8
MDH-100	100	124	115	125	56	25.2	17.2	M8
MDH-105	105	138	122.2	134.3	68	30	20	M8
MDH-110	110	143	128.2	140.3	70	30	20	M8
MDH-115	115	148	136.2	148.3	70	30	20	M8
MDH-120	120	153	138.2	150.3	70	30	20	M8
MDH-125	125	158	142.2	154.3	70	30	20	M8
MDH-130	130	163	146.2	158.3	70	30	20	M8
MDH-135	135	168	152.2	164.3	70	30	20	M8
MDH-140	140	173	156.2	168.3	70	30	20	M8
MDH-145	145	178	161.2	173.3	70	30	20	M8
MDH-150	150	183	168.2	180.3	70	32	22	M8
MDH-155	155	191	173.2	185.3	79	34	24	M8
MDH-160	160	196	178.2	190.3	79	34	24	M8
MDH-165	165	201	183.2	195.3	79	34	24	M8
MDH-170	170	206	188.2	200.3	79	34	24	M8
MDH-175	175	211	193.2	205.3	79	34	24	M8
MDH-180	180	216	207.5	219.3	79	38	28	M8
MDH-185	185	221	212.5	224.3	79	38	28	M8
MDH-190	190	226	217.5	229.3	79	38	28	M8
MDH-195	195	231	222.5	234.3	79	38	28	M8
MDH-200	200	236	227.5	239.3	79