POLYPAC – VEEPAC CH/G5

Description

Veepac is a set of fabric reinforced Chevron rings comprising of a support ring (1), sealing rings (2) and a pressure energising ring (3). In the packing set the energising axial force is transferred between the individual packing rings so that each ring is pressed into positive contact with the rod surface. Additional to the standard material special material grades are available for a large variety of working conditions. The figure shows the Veepac design.

1) “U” or base rings in standard version manufactured in reinforced fabric comprising of layers of cotton impregnated with nitrile rubber compounded to resist extrusion. This component supports the Vee Rings for effective performances.

2) Vee Rings are made of reinforced cotton fabric and nitrile elastomer, in standard version, to give good resilience, sealing efficiency and extrusion resistance.

Due to their specific design, Vee Rings are sensitive to fluid pressure variations, enabling them to deflect throughout their radial section, increase the seal loading and effectiveness in proportion to the pressures applied.

2a)Vee Rings are made of pure elastomer for high sealing efficienty.

3) Energiser or spreader rings are manufactured in acetal resin or PTFE. The function of this component is to ensure a uniform pressure distribution.

Advantages

– Very robust seal
– Non sensitive
– Adjustable
– Easy replacement in the field with split rings
– Extensive range of sizes (see symmetrical seals)
– Requires non super mating surfaces

Application Examples

• Mining equipment (with approvals)
• Excavators
• Steel mills
• Water hydraulic
• Presses
• Ship hydraulics
• Stabilizer cylinders on cranes
• Continous casting equipment

Technical Data

Operating conditions
Pressure:                   Up to 40 MPa.
Velocity:                    Up to 0.5 m/s.
Temperature:            -30_C to +200_C depending on material.
Media:                       Hydraulic fluids Mineral oil, water glycol, water emulsions.

Important Note:

The above data are maximum values and cannot be used at the same time. e.g. the maximum operating speed depends on material type, pressure, temperature and gap value.

Materials

The following material combination can be supplied:

Design Instructions

Lead in chamfers

In order to avoid damage to the Veepac during installation, lead in chamfers of min. 5 x 20_ must be provided on the rods.

The material contact area Rmr should be approx. 50 to 70%, determined at a cut depth c = 0.25 x Rz, relative to a reference line of Cref. 5%.

Clearance

The gap behind the seal should not be larger than 0.30 mm in diameter.

 

Rod Dia.			Groove Dia.				Groove Width			Seal Width	Part No.	Polypac Ref. No.
dN f8/h9			D1 H11				L +0.2			B
25,0			37,0				22,5			22,5	RCH0G0250	CH 145098 G5
25,0			40,0				22,5			22,5	RCH1G0250	CH 157098 G5
28,0			40,0				22,5			22,5	RCH0G0280	CH 157110 G5
30,0			45,0				22,5			22,5	RCH0G0300	CH 177118 G5
36,0			48,0				22,5			22,5	RCH0G0360	CH 188141 G5
40,0			55,0				22,5			22,5	RCH0G0400	CH 216157 G5
45,0			60,0				22,5			22,5	RCH0G0450	CH 236177G5
45,0			65,0				27,5			27,5	RCH1G0450	CH 255177 G5
50,0			65,0				22,5			22,5	RCH0G0500	CH 255196 G5
56,0			71,0				22,5			22,5	RCH0G0560	CH 279220 G5
60,0			80,0				37,0			37,0	RCH0G0600	CH 314236 G5
65,0			85,0				40,0			40,0	RCH0G0650	CH 334255 G5
70,0			85,0				22,5			22,5	RCH0G0700	CH 334275 G5
70,0			90,0				40,0			40,0	RCH1G0700	CH354275 G5
75,0			90,0				22,5			22,5	RCH0G0750	CH 354295 G5
80,0			95,0				22,5			22,5	RCH0G0800	CH 374314 G5
80,0			100,0				40,0			40,0	RCH1G0800	CH 393314 G5
85,0			100,0				22,5			22,5	RCH0G0850	CH393334 G5
90,0			105,0				22,5			22,5	RCH0G0900	CH 413354 G5
90,0			110,0				40,0			40,0	RCH1G0900	CH 433354 G5
100,0			115,0				30,0			30,0	RCH0G1000	CH 452393 G5
100,0			120,0				40,0			40,0	RCH1G1000	CH 472393 G5
110,0			125,0				30,0			30,0	RCH0G1100	CH492433 G5
110,0			130,0				40,0			40,0	RCH1G1100	CH 511433 G5

120,0		145,0		50,0	50,0		RCH0G1200	CH 570472 G5
125,0		140,0		34,0	34,0		RCH0G1250	CH 551492 G5
125,0		150,0		46,0	46,0		RCH1G1250	CH 590492 G5
140,0		155,0		34,0	34,0		RCH0G1400	CH 610551 G5
140,0		165,0		46,0	46,0		RCH1G1400	CH 649551 G5
160,0		180,0		40,0	40,0		RCH0G1600	CH 708629 G5
160,0		190,0		60,0	60,0		RCH1G1600	CH 748629 G5

Ordering example

Veepac Type RCH_G

Rod diameter:         dN = 70.0 mm
Groove diameter:   D1 = 85.0 mm
Groove width           L = 22.5 mm
Part No.:                   RCH0G0700 –
Material:                   N0ONC (standard)