公开(公告)号：US4819683A

公开(公告)日：1989-04-11

申请号：US150341

申请日：1988-01-29

申请人： Brian W. Buffham ,  Daniel J. Marquardt

发明人： Brian W. Buffham ,  Daniel J. Marquardt

IPC分类号： F16K17/16 ,  F16K17/14

CPC分类号： F16K17/16 ,  Y10T137/1789

摘要： A pressure release device for sealably mounting on a vessel adapted to contain a fluid under pressure not to exceed a predetermined maximum pressurization limit. The device comprises: (a) a pressure release conduit having an inlet and an outlet and providing an escape passage for the fluid to move from an outlet opening of the vessel through the inlet end of the conduit and out the outlet end of the conduit; (b) a recloseable self-activated fluid pressure release valve disposed in the outlet end of the conduit; (c) a nonrecloseable disc having a portion rupturable into fragments when the pressurization limit is exceeded and being disposed within the conduit between the outlet opening of the vessel and the release valve; and (d) a porous member disposed in the conduit between the disc and the release valve, the porous member having a total cross sectional open area at least about the sum of the cross sectional area of the rupturable portion of said disc and the cross sectional area of the outlet opening, such that when the disc ruptures in response to the pressurization limit being exceeded, fragments are restrained by the porous member from moving to the release valve, yet substantial clogging of the porous member is prevented such that the porous member maintains a cross sectional open area of at least about the cross sectional area of the outlet opening and the flow of the fluid through the conduit to the release valve is not substantially impeded.

摘要翻译： 一种用于密封地安装在容器上的压力释放装置，其适于在不超过预定最大加压极限的压力下容纳流体。 所述装置包括：（a）压力释放导管，其具有入口和出口，并且提供排出通道，用于使流体从容器的出口开口移动通过导管的入口端并从导管的出口端出来; （b）设置在导管的出口端的可再封闭的自激活流体压力释放阀; （c）当超过加压极限并且设置在容器的出口和排放阀之间的导管内时，具有可破裂成碎片的部分的不可重新接合的盘; 和（d）设置在所述盘和所述释放阀之间的管道中的多孔构件，所述多孔构件具有至少约所述盘的可破裂部分的横截面面积的总和与所述横截面积的总截面开口面积 出口开口的面积，使得当盘超过响应于加压极限而破裂时，碎片被多孔构件限制移动到释放阀，但是防止了多孔构件的大量堵塞，使得多孔构件保持 至少大约在出口开口的横截面面积的横截面开口面积和通过管道到达释放阀的流体的流动基本上不受阻碍。

公开(公告)号：US4487911A

公开(公告)日：1984-12-11

申请号：US164488

申请日：1980-06-30

申请人： Daniel J. Lange ,  Daniel J. Marquardt

发明人： Daniel J. Lange ,  Daniel J. Marquardt

IPC分类号： C08G73/10 ,  C08G69/32 ,  C08G73/12 ,  C08G73/14

CPC分类号： C08G73/1028 ,  Y10T428/31681

摘要： A stable solution of an aromatic polyamic acid of controlled molecular weight, of the type capable of being converted to polyimides, which undergoes relatively little change in viscosity or gelling over extended periods of time at room temperature. Such solution may be prepared by reacting impure aromatic dianhydride with aromatic diamine in a suitable solvent where the ratio of active aromatic diamines is approximately equimolar. Such solution may also be prepared by a two step process which comprises:Step I-Reacting a dianhydride of high purity (99+%) with a diamine in a molar ratio of about 0.95/1 dianhydride/diamine to yield a viscosity below about 10,000 cps, for example from about 2,000 to 6,000 at about a 10-15% solution.Step II-Then adding to I about 0.05 mole of a less pure dianhydride such as from about 97-99% pure dianhydride to yield a 10-15% solution of polyamic acid having a viscosity of about 10,000 cps.

摘要翻译： 可控分子量的芳族聚酰胺酸的稳定溶液，其能够转化为聚酰亚胺，其在室温下经历相对较小的粘度变化或长时间凝胶化。 这样的溶液可以通过使不纯的芳族二酐与芳族二胺在适当的溶剂中反应制备，其中活性芳族二胺的比例近似等摩尔。 这种溶液也可以通过两步法制备，该方法包括：步骤I - 使二羟基化合物与99.0％的高纯度二胺反应，其摩尔比为约0.95 / 1二酐/二胺，产生低于约10,000 cps，例如约10至15％溶液约2,000至6,000。 步骤II-然后向I加入约0.05摩尔较纯的二酐，例如约97-99％纯二酐，得到粘度为约10,000cps的10-15％聚酰胺酸溶液。