Several kinds of gate valves are introduced by JIS Marine valve Manufacturer.
(1) wedge type single gate valve
(1) the structure is simpler than the elastic gate valve;
(2) at higher temperatures, sealing performance is not as good as elastic gate valve or double gate valve;
(3) applicable to the high temperature medium easy to coke.
(2) elastic gate valve
It is a special form of wedge type single gate. Compared with wedge gate valve, the sealing performance is good at high temperature, and the gate is not easy to be stuck after being heated. Suitable for steam, high temperature oil, oil and gas and other media, and for frequent switching parts. Should not be used for easy coking medium.
(3) double gate type JIS marine gate valve
(1) the sealing performance is better than wedge gate valve, such as sealing surface Angle and seat coordination is not very accurate, still has a good sealing;
(2) after the sealing surface of the gate wear, the bottom of the spherical center of the metal pad for a thicker can be used, generally do not need to surfacing and grinding sealing surface, this single gate, elastic gate difficult to do.
(3) more parts than other forms of gate valve;
(4) in addition to suitable for steam, oil and other media, but also suitable for frequent parts of the switch and the sealing surface wear of the larger media, should not be used for easy coking medium.
(4) parallel gate valve
(1) sealing than other forms of gate valve poor;
(2) suitable for low temperature and pressure of the medium;
(3) in addition to the two gate board with a fixed board gate is not easy to fall off, where the lead wire fixed two gate board gate is easy to fall off, use is not reliable.
(4) gate and seat sealing surface processing and maintenance than other forms of gate valve simple.