After the piston cup has been used for a period of time, the sealing rubber ring of the front piston is worn and the size is reduced, then stop working. After opening the pump head, remove the fastening nut and add a hard backing plate to fill the gap of the sealing rubber ring. The wear volume is the second seal, which needs to be replaced after stopping the work and dismantling the parts, which is time-consuming.
In addition to the general requirements for sealing ring materials, polyurethane concrete pistons should also pay attention to the following conditions:
(1) High elasticity and resilience;
(2) Appropriate mechanical strength, including expansion strength, elongation and tear strength, etc.;
(3) Stable performance, not easy to swell in the medium, and small thermal shrinkage effect (Joule effect);
(4) Easy to process and shape, and can maintain precise dimensions;
(5) Do not corrode the contact surface, do not pollute the medium, etc.
Why use polyurethane material?
Polyurethane concrete pistons have the following features:
1. Excellent high extrusion/abrasion resistance;
2. Chemical resistance performance;
3. Good high temperature resistance;
4. High pressure resistance.
Shandong XinRuiTuo Precision Industry Co., Ltd. specialises in polyurethane seal industry for more than 16 years. If you have any questions about our polyurethane products, please contact +86 16653361659(Phone)/+86 15725387638(WhatsApp). We are looking forward to your coopration.
