I have a checkvalve 1 in. that would pulsate when the pump in the well would be running. 180ft deep. It has stopped pulsating when the pump is running and the pressure in the welltrol tank rises and kicks off at 50. It starts at 30 but the time to refill tank to 50 is slower than in past. 4 to 5 minutes and no vibe noise in checkvalve. When filled and not in use the pressure does not drop. If taking shower the with a slow 1.5gpm showerhead the pressure drops to below 30 if shower over 5 minutes. Before I take plastic 1 in. plumbing apart to replace checkvalve I thought I would check with this forum for advise. thanks jimbob