NOK Type Hydraulic Piston Seal SPG Manufacturer

NOK Type Hydraulic Piston Seal SPG

SPG is a compact double acting piston seal for medium to heavy duty applications. The reinforced, heat stabilized, thermoplastic sealing face with step-cut joint allows the seal to pass over ports, making it an ideal choice for double acting telescopic cylinders.

It comprises a bronze filled PTFE face ring, which is pre-loaded by a square section NBR ring. The cap ring is precision machined from a compression moulded billet. Compression moulding of the material offers consistently superior physical properties as compared to automatic moulded products. The machined face ring has chamfered corners for easy installation and a surface finish free from the “orange peel” effect associated with automatic moulded products. As only the PTFE face ring is in contact with the sliding surface, friction is very low and stick slip movement is eliminated. The housing width allows the designer to use a narrow width piston, but it is recommended that an adequate bearing be mounted on either side of the seal as shown.

Materials
Standard materials are bronze / PTFE with a NBR square section energizer.

Material	Poer-transmission fluid	Temperature	Speed	Pressure	Max. Gap F
PTFE+bronze	Mineral Oil (NBR)	-30 – +110	≦ 15m/s	160 bar	F ≦ 0.6mm
Mineral Oil (FKM)	-30 – +200		250 bar	F ≦ 0.4mm
			400 bar	F ≦ 0.2mm

Chamfers & Rad(mm)	Tolerance	Surface Finishing
μm Ra	μm Rt
S ≦	3.75	5.5	7.5	10.5	12.5	15	ØD1	H9	0.1-0.4	≦ 4
C ≧	2	3	5	7.5	8	8.5	Ød1	h9	≦ 1.6	≦ 10
r1 ≧	0.4	0.8	1.2	1.6	1.6	2.0	L	+0.2 – 0	≦ 3.2	≦ 16

SPG PISTON SEAL LIST

ITEM NO.	SIZE
SPG	d	D	h	H	C
30	20.5	30	4.3	4.5	2
31.5	22	31.5	4.3	4.5	3.5
32	22.5	32	4.3	4.5	3.5
35	25.5	35	4.3	4.5	3.5
35.5	26	35.5	4.3	4.5	3.5
40	30	40	4.3	4.5	3.5
45	35	45	4.3	4.5	3.5
50	40	50	4.3	4.5	4
55	45	55	4.3	4.5	4
56	46	56	4.3	4.5	4
60	50	60	4.3	4.5	4
63	48	63	7.3	7.5	4
65	50	65	7.3	7.5	4
69	54	69	7.3	7.5	4
70	55	70	7.3	7.5	5
71	56	71	7.3	7.5	5
75	60	75	7.3	7.5	5
80	65	80	7.3	7.5	5
85	70	85	7.3	7.5	5
90	75	90	7.3	7.5	5
95	80	95	7.3	7.5	5
100	85	100	7.3	7.5	5
105	90	105	7.3	7.5	5
108	92	108	7.3	7.5	5
110	94	110	7.3	7.5	5
112	96	112	7.3	7.5	6.5
120	104	120	7.3	7.5	6.5
125	109	125	7.3	7.5	6.5
130	114	130	7.3	7.5	6.5
135	119	135	7.3	7.5	6.5
140	124	140	7.3	7.5	6.5
145	129	145	7.3	7.5	6.5
150	134	150	7.3	7.5	6.5
155	139	155	7.3	7.5	6.5
160	144	160	7.3	7.5	6.5
170	148	170	10.8	11	6.5
180	158	180	10.8	11	6.5
190	168	190	10.8	11	6.5
200	178	200	10.8	11	6.5
204	182	204	10.8	11	6.5
210	188	210	10.8	11	6.5
215	193	215	10.8	11	6.5
220	198	220	10.8	11	6.5
224	202	224	10.8	11	6.5
225	203	225	10.8	11	6.5

ITEM NO.	SIZE
SPG	d	D	h	H	C
230	208	230	10.8	11	6.5
240	218	240	10.8	11	6.5
250	228	250	10.8	11	6.5
260	236	260	11.7	12	7.5
270	246	270	11.7	12	7.5
280	256	280	11.7	12	7.5
290	266	290	11.7	12	7.5
300	276	300	11.7	12	7.5
310	286	310	11.7	12	7.5
320	296	320	11.7	12	7.5
330	308	330	9.75	10	10
360	336	360	11.7	12	10
400	376	400	11.7	12	10
485	455	485	14.8	15	10
500	470	500	14.8	15	10
550	515	550	17.2	17.5	10
600	570	600	14.8	15	10
650	620	650	14.8	15	15
720	690	720	14.8	15	15
800	785	800	12.7	13	15
900	870	900	24.5	25	15
930	890	930	19	20	15
935	920	935	12.7	13	15
950	925	950	17.7	18	15
1000	960	1000	19.7	20	20
1060	1020	1060	19.7	20	20
1120	1080	1120	19.7	20	20
1150	1110	1150	19.7	20	20
1180	1130	1180	19.7	20	20
1210	1170	1210	19	20	20
1250	1210	1250	19.7	20	20
1260	1220	1260	19.7	20	20
1400	1350	1400	19.7	20	20
1500	1460	1500	19.7	20	20
1650	1600	1650	24	25	20