Suction valves, discharge check

Suction ond Discharge Shut-down Valves, Discharge Check... 

The pump is equipped with all-welded, double-ball, gravity-operated suction and discharge check valves. The 1-in. balls operate in close-fitting cages (0.010-in. diametral clearance) which maintain the alignment of the ball and scat and restrict the ball lift to 0.125 in. 

Suction and Discharge Shutdown Valves and Discharge Check Valves... 

Fig. 4.1-35. Diaphragm compressor (HOFER). a, Diaphragm b, Gas space c, Discharge valve d, Suction valve e, Diaphragm cover f, Perforated plate g, Hydraulic cylinder h, Oil overflow valve i, Oil return j, Cylinder cooling k, Check valve 1, Crank drive m, Cooling-water in/out n, Oil-cooling coil o, Oil chamber p, Oil injection (leakage compensation) q, Compensation pump r, Check valve s, Oil supply.

Both the discharge valve and the intake or suction valve are simply spring-loaded check valves. The discharge valve permits gas only to be forced out of the cylinder. The intake valve permits gas only to enter the cylinder. 

The ball valves are a kind of check valve on suction and discharge and move according to... 

For larger pumps with the suction on top of the pump case, a spill-back warm-up line connected to the case is needed to evenly warm up the pump. For all hot pumps, a spill-back bypass is needed aroimd the pump s discharge check valve for warm-up when switching pumps. 

Open the spillback around the discharge check valve to warm the pump case. For pumps with the suction on top of the pump s case, open the connection allowing the hot spill-back flow to recirculate to the bottom of the pump. The suction valve needs to be partly open. Wait until the pump case is uniformly warm. Starting a pump that is cold or unevenly... 

Check valve is used at pump suction or discharge to admit or discharge liquid. There are many types of valves, such as plate, wing, bail, plug, and sluny valves, etc. Their usage depends on the application. 

The suction and discharge valves inside a cylinder are spring-loaded check valves, lliey require a small differential pressure m open them. Therefore, at.sactiDn stroke, the pressure inside the cylinder is less than the suction line pressure, and at discharge stroke, the pressure inside the cylinder is higher than the discharge line pressure. 

Check valves must be used on each pump discharge to prevent backflow through the idle pump. On those systems where a flooded suction is not furnished, an orificed bypass around the appropriate check valve should be furnished to keep the suction line of the non-flooded suction... 

A more serious incident occurred at a plant in which ethylene oxide and aqueous ammonia were reacted to produce ethanolamine. Some ammonia got back into the ethylene oxide storage tank, past several check valves in series and a positive pump. It got past the pump through the relief valve, which discharged into the pump suction line. The ammonia reacted with 30 m of ethylene oxide in the storage tank. There w as a violent rupture of the tank, followed by an explosion of the vapor cloud, which caused damage and destruction over a wide area [4],... 

By-pass lines for pumps and compressors, with a connecting line from the pressure-side to the vessel on the suction-side. This safety risk is eliminated in most cases by using a check-valve in the discharge line after the branch to the by-pass valve. 

Discharge and suction check valves cleaned NA NA N <1 Operational Feed system... 

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