pressure seal

The characteristics and application of the cock valves were introduced in detail in view of the fact that oil seal cock valve and pressure equilibrium conical oil seal cock valve were in use worldwide in oil and gas transportation piping.

并根据世界各国的输油及输气管线广泛采用油封式旋塞阀和压力平衡式倒锥油密封旋塞阀的情况，重点介绍其特点和应用。

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They are the pressure seal valve, the packed valve, and the diaphragm valve.

它们是压力密封阀 、 衬垫阀和隔膜阀.

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Pressure seal is only formed in mudstone cap rock with undercompaction and its seal capability can be computed by equivalent depth method and sonic moveout value.

压力封闭的形成仅存在于具有欠压实的泥岩盖层中，其封闭能力的大小可根据等效深度法和利用声波时差值计算得到。

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With built-in type, single seal face and single spring, U-ring is used for rotating ring auxiliary seal, high reliable seal, fitting for high-pressure petrochemical process pump.

内装式、单端面、单弹簧、平衡型，动环辅助密封采用U形密封圈，密封可靠，适合高压石油化工流程泵。

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The backing pressure of seal changed, in the mean time clean gas supply is changing accordingly to keep constant different pressure between seal gas supply and backing pressure. This will ensure a stable working environment of DGS.

干气密封背压变化时，密封气供应需保持动态跟随，使密封气与其背压之间的压差保持恒定，以此来保证干气密封稳定的密封环境。

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The design of the reinforcing ring and the calculation of external pressure seal were summarized, which had been used as the design basis of the FRP vacuum equipments with the practical example of barometric condenser.

通过气压冷凝器设计的实例，表明这一方法己成功地用作玻璃钢真空设备的设计依据。

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Based on pressure and high low temperature cycling tests and theoretic analysis, the threaded joint parts filled with sealing glue compound show excellent seal ability, and can be applied to SRM.

通过压力、高低温循环等大量的试验和理论分析表明：采用填充密封胶的螺纹联接密封结构具有优异的密封性，适宜在固体火箭发动机环境中应用。

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With the replacement pressure information obtained from the relation, the variability of capillary seal ability of mudstone caprock in section plane and in areal plane can be studied.

根据此关系，利用声波时差可获得大量的排替压力信息，据此不仅可以研究泥岩盖层毛细管封闭能力的剖面变化特征，而且还可以研究泥岩盖层毛细管封闭能力的平面变化特征。

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Operating Principle: The pressure seal valve is a hand wheel-operated valve using a two-piece valve stem.

运转原理: 压力密封阀是使用两个阀杆的手轮操作阀门.

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Design of New Type of Die Casting Mould with Tightwire and Idler Wheel for Angle Core Pulling The Air Pressure Seal Equipment of the Bearings in the Idler Pulley Assembly of the WEDM

新型钢丝绳滚轮斜抽芯压铸模设计线切割机上下导轮轴承气压密封装置

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The effect of spring pressure on friction characteristic and seal capability of the balanced mechanical seal is analyzed, and the balanced mechanical seal is tested in the test device which spring pressure of mechanical seal can be adjusted during its operation.

分析了弹簧比压对平衡型机械密封摩擦特性和密封性能的影响，利用自行研制的动态下弹簧比压可控机械密封试验装置对平衡型机械密封进行了试验。

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In order to endure certain external pressure and seal well, the stainless steel spherical shell is designed and manufactured.

为了能承受一定的外部压力并很好地实现密封，设计并采用粘性介质压力成形工艺制造了不锈钢球壳阀芯。

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An ideal floating-head exchanger pressure test positioner, general purpose O-type ring seal pressure test positioner was introduced, and a comparison between packing seal pressure test positioner and C-type ring seal pressure test positioner was also made both in theory and application effect.

介绍了一种理想的浮头式换热器试压胎具&通用O型环密封试压胎具，并在原理上和使用效果上与填料密封试压胎具和C型环密封试压胎具进行了比较。

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Describe the structure characteristic and working principle of pressure seal swing check valve. Material selection and thrust ring design.

阐述了自压密封旋启式止回阀的结构特点、工作原理、材料选用和止推环设计。

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