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衡探BW250/50泥浆泵的柱塞是采用陶瓷柱塞，它在往复运动中，温度必须保持在70℃以下，因此采用外冷却（即一根冷却水管的水对准每个柱塞冲洗冷却）。在实际使用中，经常发生柱塞炸裂事故，严重影响正常钻进生产。由于在机场更换陶瓷柱塞比较麻烦，根据我们野外队修配间的具体条件，用柴油机上更换下来的废铝合金活塞自行铸造空芯柱塞，见附图（在柱塞压紧螺帽端钻7毫米孔四个，使柱塞内腔保持有水，并与进水管和出水管的水连通，由外冷却变成内冷却）。经我队18台BW250/50泥浆泵的实际使用，具有以下特点：
The probe of the BW250 / 50 mud pump is a ceramic plunger with a temperature of 70 ° C or less during reciprocation, so external cooling (ie, cooling the water in one cooling line to each plunger for flush cooling ). In actual use, frequent occurrence of plunger burst, seriously affecting the normal drilling production. As the replacement of ceramic plunger at the airport is too much trouble, according to the specific conditions of our field team repair fitting, replace the waste aluminum alloy piston on the diesel engine hollow cast plunger, see the attached picture 7 mm holes four, so that the plunger cavity to maintain water, and with the water inlet and outlet water connectivity, from external cooling into internal cooling). The actual use of 18 BW250 / 50 mud pumps by our team has the following features: