Parker Prädifa Piston Sealing Set ZQ

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The Parker Prädifa piston sealing set profile ZQ was developed from our profile ZC. It is especially suitable for use in telescopic legs with the bottom value. This sealing set consists of a one-part rubber-fabric sealing ring and very sturdy “semi-active” back-up rings. The dynamic surface of the seal is reinforced with a special fabric, retaining favourably the lubricating film between seal and cylinder wall, even after long standstill periods under high pressure. The breakaway friction and the dynamic friction will be considerably less wear of the seal.

Field of application:

Working pressure: ≤ 1500 bar
Working temperature: HFA-, HFB, and HFC-fluids: +5 to 60 ºC Mineral oil: -20 to +80 ºC

Surface speed: ≤ 0,1 m/s

Mainly for double-acting pistons in hydraulic props and tunneling machines.

Installation:

The Parker Praedifa sealing sets ZQ … 00250 and ZQ … 00270 are for use on one-piece pistons. The Sealing Sets of the series ZQ … 00254 and ZQ … 00274 require open housing (divided piston). To avoid damaging
care should be taken that the seals are not pulled over sharp edges during installation.

Compounds:

Standard compound for the sealing partis an NBR-based elastomer (Z5017) with the fabric-reinforced dynamic surface (SEW-compound). The back-up rings are made of a polyacetal-based material (W5001).

For special requirements (pressure, temperature, speed, etc.) please contact our Consultancy Service, so that suitable materials and/or designs can be recommended.

D d L D1 Item number 
105 80 22,5. 104,2 ZQ 0105 00274
110 95 25 109,2 ZQ 0110 00270
120 105 23 119,2 ZQ 0120 00270
130 105 30 129,2 ZQ 0130 00270
140 115 25,5 139,2 ZQ 0141 00270
140 120 31,5 139,2 ZQ 0140 00270
150 130 29 149,2 ZQ 0150 00270
150 130 29 149,2 ZQ 0150 00274
160 143 26 159,2 ZQ 0160 00270
165 140 30 164,2 ZQ 0164 00270
165 145 33 164,2 ZQ 0164 00270
165 145 31 164,2 ZQ 0165 00270
173 153 31,5 172,2 ZQ 0173 00270
180 163 25 179,2 ZQ 0180 00270
190 170 25 189,2 ZQ 0190 00270
200 175 31,5 199,2 ZQ 0200 00250
200 175 31,5 199.2 ZQ 0200 00254
220 195 36 219,2 ZQ 0220 00270
235 210 30 234.2 ZQ 0235 00270

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