American Standard Pressure Self-Sealing Globe Valve PJ41

▶ High-pressure hydrogenation gate valve packing seal structure

⊙ Increase the packing depth and quantity of packing to improve the sealing performance of the packing material.
⊙ Fillers are selected from domestic first-line brands, or even imported brands, such as Shandong Binzhou and GARLOCK, to improve the quality of fillers.
⊙ Improve the assembly process, because the flexible graphite ring is relatively loose from a microscopic point of view, each packing material is pre-compressed before assembly, and each packing material is compacted by a special tool with a pressing force of 28MPa, and then assembled, so it can maintain a long seal.
⊙ Improve the structure of the packing part, place two circles of graphite + stainless steel packing at the bottom of the packing box, to use its high strength (compared with pure flexible graphite ring) characteristics to prevent graphite from being squeezed into the valve cavity and outside the valve, add three more circles of pure flexible graphite on the packing, use the lubricity of flexible graphite to reduce the friction on the valve stem and reduce the opening torque of the valve, and add two more circles of graphite packing to the upper part of the flexible graphite ring, so as to superimpose the placement, which plays a multi-level sealing effect of the packing. Improved stem packing sealing performance.

▶ High-pressure hydrogenation gate valve stem process

⊙ The stem is forged in one piece. Suitable for high temperature and high pressure working conditions, due to the unstable temperature of the medium, may cause a certain temperature difference, the overall forged valve stem head has high tensile strength, and the increase in tension when the valve plate is opened will not cause the valve stem head to break, resulting in the valve disc falling into the valve body and unable to function.
⊙ The stem is heat treated to meet the performance requirements of the design. The valve stem is all processed by CNC machine tools, using special processing technology to ensure the roughness, coaxiality, straightness and other design requirements of the valve stem; The opening torque of the valve is also a very important indicator of the performance of the valve, the improvement of the valve stem accuracy and the improvement of the quality of the packing material, can effectively reduce the closing torque of the valve, so that the valve operation is flexible.
⊙ The valve stem thread adopts rolled trapezoidal thread to improve the strength of the thread and the transmission performance of the thread.
⊙ The valve is equipped with an upper sealing structure, when the packing fails, the upper seal structure can effectively play a role in safety sealing and ensure the reliability of the valve seal. Our company has mature experience in the selection of valve stem materials, the control of mechanical properties, and the guarantee of processing accuracy and good valve operation performance.

High pressure hydrogenation shut-off valve

The shut-off valve for high-pressure hydrogenation device is a kind of shut-off valve suitable for high-pressure hydrogen working conditions such as hydrogen (containing hydrogen sulfide), hydrogen refueling gas, and hydrogen refueling products (containing hydrogen sulfide). For the valve with nominal pressure ≥PN160 or Class900 and nominal size ≥DN50, it is designed as an internal pressure self-sealing structure, and the corresponding part of the inner cavity of SS+ flexible graphite or metal sealing ring is placed in the middle cavity with hardfacing cemented carbide.