4RV-AF泡沫泵泵座上有與底板或基礎(chǔ)固定用的法蘭孔。泵殼頂上設(shè)有充水和放氣的螺孔，以便在泵啟動前用來充水及排走泵殼內(nèi)的空氣。在泵吸水和壓水錐管的法蘭上，開設(shè)有安裝真空表和壓力表的測壓螺孔。在泵殼的底部設(shè)有放水螺孔，以便在泵停車檢修時用來放空積水。另外，在泵座的橫向槽底開設(shè)有泄水螺孔，以便隨時排走由填料盒內(nèi)流出的滲漏水滴。所有這些螺孔，如果在泵運動中暫時無用時，可以用帶螺紋的絲堵(又叫“悶頭")栓緊。

上述的零件中，葉輪和泵軸是離心泵中的轉(zhuǎn)動部件，泵殼和泵座是離心泵中的固定部件，此兩者之間存在著3個交接部分，它們是:泵軸與泵殼之間的軸封裝置為填料盒，如圖2-4中11所示;葉輪與泵殼內(nèi)壁接縫處的減漏裝置為減漏環(huán)，如圖2-4中12所示;以及泵軸與泵座之間的轉(zhuǎn)動連接裝置為軸承座，如圖2-4中13所示。

The 4RV-AF foam pump seat is provided with flange holes for fixing to the baseplate or foundation. There are screw holes on the top of the pump casing for water filling and air release, which are used to fill water and remove air from the pump casing before starting the pump. On the flange of the pump suction and pressure cone, there are pressure measuring screw holes for installing vacuum and pressure gauges. There is a drainage screw hole at the bottom of the pump casing for emptying accumulated water during pump shutdown and maintenance. In addition, a drainage screw hole is set at the bottom of the transverse groove of the pump seat to drain any leaking water droplets that flow out of the packing box at any time. All these screw holes, if temporarily useless during pump operation, can be tightened with threaded plugs (also known as "plugs").

Among the above parts, the impeller and pump shaft are the rotating components in the centrifugal pump, while the pump casing and pump seat are the fixed components in the centrifugal pump. There are three intersecting parts between these two parts: the shaft sealing device between the pump shaft and pump casing is a packing box, as shown in Figure 2-4, Figure 11; The leakage reducing device at the joint between the impeller and the inner wall of the pump casing is a leakage reducing ring, as shown in Figure 2-4, Figure 12; The rotating connection device between the pump shaft and the pump seat is the bearing seat, as shown in Figure 2-4, Figure 13.