Different cock structure characteristics and design standards of pneumatic valve

cock pneumatic valve structure characteristics and design standards


number

name

structure

applicable design standards




tight pattern cock pneumatic valve

without packing, the plug and body sealing surface of the pressure on tight the nut below. Simple structure, less parts, processing capacity is small, the cost is low. Seal level is not high, is generally used in DN or less. MPa

JIS B-
MSS - SP- -
b -
GB / T -




filler plug pneumatic valve

by compression packing, the plug and body sealing surface pressure, seal level is higher, a large number of used in medium and low pressure pipe

JIS B -
D - API
b -
b -
b -
MSS - SP- -
API -
API -
GB / T -




pneumatic valve sealing plug

the sealing between the plug and plug rely mainly on the pressure of the medium itself, plug little head out of the normal pressure; Plug the holes into the bulk, will plug up pressure. The following spring pre-tightening role mainly. This kind of structure is generally used in air medium


reference JIS B -
MSS - SP- -
b -
GB / T -




oil lubrication cock pneumatic valve

screw at the top of the twisted cock; Sealing grease can be by check pneumatic valve is forced into the sealing face to improve sealing performance. Packing gland adopts screw type or plate type. Can adopt thread connection end flange, butt welding, socket,

BS -




oil lubrication cylindrical plug plug pneumatic valve

the cylindrical plug, the rest with the serial number

BS -




soft seal cock pneumatic valve

cock with conical or cylindrical. All or part of the lining soft lining material. Can use flange, threaded connection end, socket welding, butt welding

BS -




t cock pneumatic valve

tee, the rest with the serial number


reference JIS B -
MSS - SP- -
b -
GB / T -




or oblique Angle type pneumatic valve plug

the import and export of cock is right Angle type or not on the same straight line straight through. Other features with filler plug pneumatic valve

JIS B -
MSS - SP- -
b -
GB / T -




hot cock pneumatic valve

plug at the top of hoisting mechanism. When open, lift plug, first with pneumatic valve seal face off. The pneumatic valve operating torque is small, less wear of sealing surface, long life; Can also be used for high temperature under the condition of

ASME B. -




type fire cock pneumatic valve

made of Monel alloy pneumatic valve body and cock. In the pneumatic valve pressure into a ptfe sealing sleeve, using plug and seal tightly, to achieve sealing effect. At the bottom of the pneumatic valve rod sealing device for a ptfe diaphragm, diaphragm lateral also placed a flexible graphite sealing ring. Diaphragm and the top of the sealing ring with a diaphragm cover, Monel alloy using gland ptfe diaphragm and flexible graphite sealing ring and pneumatic valve body pressure. Pneumatic valve stem is packed in a packing sleeve, sleeve bottom is equipped with a circle of the flexible graphite packing. Through bolts, to the set of compaction pressure, on the one hand, make the pneumatic valve stem packing squeezed, on the other hand, both the inner pressure of the diaphragm into the pit of cock, formed the lip seal. This kind of sealing structure with the aid of the pressure in the pneumatic valve, can be a self-styled role. In addition, one thousand fires, heat-resistant flexible graphite seal can still stop in the pneumatic valve leakage of medium, is advantageous for the fire extinguishing






lining ptfe cock pneumatic valve

and port: cut-through
, pneumatic valve, pneumatic valve cover and plug for the casting of the carbon steel or stainless steel
, pneumatic valve body lined with ptfe
and plug the pressure against the connection of pneumatic valve body and valve cover bolts. Pneumatic valve, pneumatic valve cover between the adjustment pads, the adjusting cushion should not only guarantee the pneumatic valve body between the pneumatic valve cover and no leakage and to ensure that the cocks and sealing performance of lining suite
, connection forms: flange connection

GB/T -




pneumatic valve oil seal cock

and port: cut-through
, pneumatic valve, pneumatic valve cover and plug are dry
in pneumatic tank body and cock, cock in handle: have you a check pneumatic valve sealing grease injection on sealing grease injection enhancing sealing performance
, pneumatic valve body and bonnet joint bolt, pneumatic valve body and valve cover has adjust pad, between the adjusting cushion should not only guarantee in a pneumatic valve body and valve cover points, and to ensure the cocks and pneumatic valve sealing performance
and connection between form:
flange connection, suitable for oil and gas pipeline

API D -
API -




pressure balance type pour cock pneumatic valve

and port: cut-through
, pneumatic valve, pneumatic valve cover and plug are steel, cock inversion, on the big small, under the cock with through holes to plug the big end and small end hole, to small end hole is equipped with pneumatic valve, check valve is closed, large and small are equal, the medium pressure due to the large end face is big, so the total force pushing cock up, make it easy to pneumatic valve seal, at the moment on the leakage of the big end and small end check pneumatic valve, pressure relief, then small the total force is greater than the big end, push the cock down, lower the open torque, easy opening
, pneumatic valve, pneumatic valve cover connecting bolts, and adjust the pads not only ensure pneumatic valve, pneumatic valve cover seal, pneumatic seal between the body and cock and
, a pneumatic valve body and cock sealing surface groove can sealing grease injection enhance sealing performance
and connection form:
flange connection, nominal pressure level for CL ~ CL is suitable for the oil and gas pipeline

API D -