PTFE Piston Rod Seals for Hydraulic Cylinder Excavator Seals URD

URD

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1.Application and properties:

Suitable for single-acting sealing of hydraulic reciprocating rod. and has excellent dynamic and static sealing performance at high, medium and low pressure.

The sealing surface has two lips, and the sealing medium between the two lips is used as a lubricant, which avoids dry friction and wear to a certain extent, and the friction coefficient is greatly reduced compared with the sealing parts of the same type of single lip, and the life is prolonged. The double mouth structure prevents the entry of outside air, reduces the gas in the working medium, and increases the sealing capacity at low pressure.

It is suitable for a wide range of working pressures and can be used independently at medium to low pressures. The pressure resistance can also be enhanced by adding retaining rings. At higher pressures, it can be used in combination with a buffer seal. By adding a buffer seal in front of this seal and installing a retaining ring at the base of this seal, the sealing system can withstand pressures up to 35MPa.

Operating temperature range from -30°C to +110°C.

The installation groove meets the requirements of ISO5597/1 international standard. Non-standard sizes are also available.

Closed groove, easy installation of seals.

Strong residual oil retraction ability under reciprocating motion, with minimal residual oil on the piston rod.

2.Standard Material

NBR, Hardness: Shore 93A

3.Working conditions

Working Conditions

Diameter

Range

Pressure

Range

Temperature

Range°C

Speed

Medium

16～500mm

0～35MPa

-30～110℃

0.5m/s

Hydraulic oil

4. Related Dimensions

R1=0.2～0.5; R2=0.1～0.2; R3=0.2～0.3; C=(0.5～1)L; The specific values are selected according to the section size of the seal. The remaining values are referred to Installation Dimensions table: L stands for the Groove Width without back-up ring and L1 stands for the groove Width with back-up ring.

5. Annotation method

Marking it with the dimension of installation groove as below：

For example: the first seal in Installation Dimensions table is marked as URD-16×24×6.3

6. Installation Dimensions

Rod	Groove	Groove	Groove	Rod	Groove	Groove	Groove
Dia.	Dia.	Width	Width	Dia.	Dia.	Width	Width
d	D	L	L1	d	D	L	L1
16	24	6.3	8.3	65	75	13	16
16	26	8	10	65	85	12.5	15.5
20	30	8	10	68	78	13	16
22	32	8	10	70	80	13	16
25	33	7.3	9.3	70	85	12.5	15.5
25	35	8	10	75	88	11	14
26	36	11	13	75	90	11	14
28	36	7.5	9.5	78	86	12.5	15.5
28	38	8	10	80	90	13	16
30	40	11	13	80	95	12.5	15.5
30	45	11	13	80	100	13	16
32	42	8	10	85	93	12.5	15.5
32	42	11	13	85	100	13	16
32	45	11	13	90	98	12.5	15.5
35	45	11	13	90	105	12.5	15.5
35	47	17.5	19.5	92	107	12.5	15.5
36	46	8	10	95	115	13	16
36	51	11	13	100	108	13	16
40	49.5	10.5	13.5	100	120	16	19
40	50	11	14	105	113	12.5	15.5
40	52	9	12	107	115	12.5	15.5
40	55	12.5	15.5	110	125	16	19
43	53	8	11	110	130	16	19
45	53	6.3	9.3	118	126	14	17
45	55	8	11	120	130	15	18
45	55	11	14	125	133	12.5	15.5
45	60	12.5	15.5	130	145	13	16
46	56	11	14	140	160	16	19
48	56	12.5	15.5	145	153	12.5	15.5
50	60	8	11	150	170	16	19
50	60	11	14	152	160	10	14
50	65	12.5	15.5	160	185	20	24
52	62	11	14	167	175	12.5	16.5
55	65	11	14	170	200	19	23
55	67	11	14	176	186	13	17
56	71	12.5	15.5	180	188	12.5	16.5
60	68	14	17	193	201	12.5	16.5
60	70	8.5	11.5	200	211	13	17
60	70	11	14	200	225	20	24
60	75	11	14	220	250	25	29
63	71	8	11	223	231	12.5	16.5
63	78	12.5	15.5	230	260	25	29
64	72	10	13	250	280	25	29
65	73	12.5	15.5	280	310	19	23

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