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日本SAKAGAMI阪上气封PPD是一种双重压力式活塞密封件，专注于偏心和耐用性与摩擦特性之间的平衡，与PSD型兼容。
| 标准型号 | 密封件的公称尺寸及安装尺寸 (単位：mm） | 兼容互换 | ||||
| （RN 729） | D*d*H | G | D1 | L | ||
| PPD-10 | 10*5.4*1.6 | 1.8 | +0.1 | 9.7 | 1.5 | PSD-10 |
| PPD-12 | 12*7.4*1.6 | 1.8 | 11.7 | 1.5 | PSD-12 | |
| PPD-15 | 15*10.4*1.6 | 1.8 | 14.7 | 1.5 | PSD-15 | |
| PPD-16 | 16*11.4*1.6 | 1.8 | 15.7 | 1.5 | PSD-16 | |
| PPD-20 | 20*14*2.2 | 2.4 | 19.5 | 1.5 | PSD-20 | |
| PPD-25 | 25*17*3 | 3.2 | +0.15 | 24.5 | 2 | PSD-25 |
| PPD-30 | 30*22*3 | 3.2 | 29.5 | 2 | PSD-30 | |
| PPD-32 | 32*24*3 | 3.2 | 31.5 | 2 | PSD-32 | |
| PPD-40 | 40*32*3 | 3.2 | 39.5 | 2 | PSD-40 | |
| PPD-50 | 50*40*3.7 | 4 | +0.25 | 49.5 | 2.5 | PSD-50 |
| PPD-63 | 63*53*3.7 | 4 | 62.4 | 2.5 | PSD-63 | |
| PPD-80 | 80*65*5.6 | 6 | 79.4 | 3 | PSD-80 | |
| PPD-100 | 100*85*5.6 | 6 | 99.4 | 3 | PSD-100 | |
| PPD-125 | 125*110*5.6 | 6 | 124.3 | 3.5 | PSD-125 | |
| PPD-140 | 140*125*5.6 | 6 | 139.3 | 3.5 | PSD-140 | |
| PPD-160 | 160*140*7.6 | 8 | 159.3 | 5 | PSD-160 | |
| PPD-180 | 180*160*7.6 | 8 | 179.3 | 5 | PSD-180 | |