if you mean between the pump body and the end casting, and tightly sandwiched then so long as the cord diameter is chosen to give a good squashing out of round, without meaning it will not close, it should be fine (SAE reccommend crushing 10 to 20% of diameter,. and allowing 20-30% for sideways expansion (so for example a 3mm cord in a channel 2.5mm high in the seal direction (16% compression), but 3.5-3.8 wide to allow for the necessary distortion).
I have had success with these rules with designs to 5m immersion testing. It may do more, that is the limit of our test rig. ? ). ~If it was a motor seal I'd be more worried, those need a few % of stretch around the shaft, and that puts the glue join at a disadvantage.
if you mean between the pump body and the end casting, and tightly sandwiched then so long as the cord diameter is chosen to give a good squashing out of round, without meaning it will not close, it should be fine (SAE reccommend crushing 10 to 20% of diameter,. and allowing 20-30% for sideways expansion (so for example a 3mm cord in a channel 2.5mm high in the seal direction (16% compression), but 3.5-3.8 wide to allow for the necessary distortion).
I have had success with these rules with designs to 5m immersion testing. It may do more, that is the limit of our test rig. ? ). ~If it was a motor seal I'd be more worried, those need a few % of stretch around the shaft, and that puts the glue join at a disadvantage.
