1 , domestic gas valve works
On top of the valve opening is the use of the adjusting screw clockwise twist , the elastic force generated by the spring contraction , the guide valve diaphragm is recessed downward , acting on the valve rod guide forces on the downward displacement of the guide to open valves. When the pilot valve is opened, the upstream inlet pipe section through a steam chamber a channel ( for the steam regulator channel ) , through the pilot valve pilot valve into the annular steam chamber , the � -channel directly to the cylinder below the piston chamber . In a continuous supply of the steam chamber , the pressure continues to rise, pushing the piston down to open the main valve , then a steady stream of steam flow from a to b chamber cavity . When the downstream outlet pipe sections b met within the load chamber , more than steam pressure inside the cavity and the rising b . A pressure rising passage through  (pressure sensing channels ) feedback to the pilot valve diaphragm chamber , the pilot valve diaphragm protruding upward , overcoming the spring pressure of the upper adjusting the pilot valve is turned down or off. Thus , turn down or turn off the steam from the upstream a -channel source . The cylinder when the piston chamber pressure drops below the reset action of the spring , the main valve is turned down or closed, and the pressure inside the cavity b began to decline, so that cycle to achieve the purpose of regulating .

2 , imported  gas valve works
When the pilot valve opened, the upstream pipe section into a cavity inside the steam quickly filter cover, through the pilot valve reaches a channel ( for the steam regulator channel ) , when a channel filled with steam is sent directly after the main valve diaphragm lower chamber , while part of the steam through the b channel ( pressure control channel ) is divided into b cavity . Under the main valve diaphragm chamber at a constant steam supply channel under pressure after felling diaphragm protruding upward , pushing the main thrust generated by the upward movement of the valve stem to open the main valve , the same steam pouring from a chamber to chamber b . When the downstream outlet pipe to meet the case of load , more steam than the b also rising pressure inside the cavity , the pressure rising by c Channel (pressure sensing channels ) to the steam chamber under the pilot valve diaphragm , this when the pilot valve diaphragm protruding upward , overcoming the upper adjusting spring pressure of the pilot valve is turned down or off , reducing and cutting off from a steam chamber . When the main valve diaphragm chamber under pressure gradually decreases , the upper main valve spring play a role , so that felling spool down back seat , the main valve is shut down or disable ( excess vapor released into the same channel through b b chamber , the main valve is quickly closed ) , such that b chamber pressure declining , so to achieve adjustable. ( The principle of the pilot valve opens the inlet valve and domestic valves same )

3 , condensate water damage mechanism of voltage regulation function
When the downstream pressure rises (b cavity ) downward pressure when needed . Under normal circumstances b chamber high pressure through the pressure sensing channel  transmitted to the pilot valve , the pilot valve off a small or closed, thereby turning on and off from a small chamber steam source . When the condensate water intrusion into the cylinder , the annular gas chamber , due to the characteristics of the water can not be compressed , this time , the main valve return spring completely lost the role , the piston can not upward, main valve can not be closed , the entrance (a cavity ) is still a steady stream of steam through the normally open main valve inflow b chamber . High pressure so out of control . When the system is full of condensate a, b , and the main channel under the diaphragm cavity . Thrust from a steam chamber , the main valve diaphragm is in the up state muster . Similarly, incompressible water features, the upper return spring not down back seat , the main valve is also a normally open state , the steady destruction of regulatory function .
Although the valve is proportional valve, however, when the valve is filled with condensate these core parts , the proportional regulating properties completely changed, the key problem is that the role of friction of moving parts and the operation sequence has the time difference , determines the main valve movement with a lag . ( Pilot valve action earlier , the main valve in the rear trailing ) and (c) when received from the  overpressure channel message, first of all, turn down or turn off the pilot valve . Thus, the cut off valve condensate retreat , apparently , the piston and the main valve diaphragm can not exercise .

According to the above can be learned , the system condensate water heating project one hundred harm . So the system is destroyed condensate steam valve regulator adjustment function most basic reason .