초록 ▼

A bulk material container in which a manhole cover has a relief valve. The relief valve includes a resilient spacer ring disposed between a valve seat of the relief valve and a valve plate. A spring urges the valve plate of the relief valve toward the valve seat. When the fluid pressure in the conta

A bulk material container in which a manhole cover has a relief valve. The relief valve includes a resilient spacer ring disposed between a valve seat of the relief valve and a valve plate. A spring urges the valve plate of the relief valve toward the valve seat. When the fluid pressure in the container exceeds a predetermined magnitude, the valve plate is lifted away from the valve seat against the urgency of the spring to vent the fluid in the container to atmosphere. A bulk material container in which a manhole cover has a relief valve. Vacuum relief apertures are formed in a backing plate of the relief valve. The vacuum relief apertures communicate with the fluid in the container and atmosphere. A disc closes the vacuum relief apertures until displaced when the fluid pressure of the fluid within the container is less than atmospheric pressure to provide a path for air under atmospheric pressure to flow into the container through the vacuum relief apertures.

대표청구항 ▼

A bulk material container comprising: (a) a shell for containing fluid under pressure, said shell being formed with a first opening for depositing fluid under pressure in said shell; (b) a cover for closing said first opening detachably secured to said shell, said cover being formed with a second op

A bulk material container comprising: (a) a shell for containing fluid under pressure, said shell being formed with a first opening for depositing fluid under pressure in said shell; (b) a cover for closing said first opening detachably secured to said shell, said cover being formed with a second opening communicating with said first opening formed in said shell; (c) a valve seat surrounding said second opening; (d) a displaceable valve plate disposed over said second opening, said valve plate being formed with a first central opening; (e) a latch mounted on said cover, said latch being formed with a second central opening aligned with said first central opening; (f) a retaining member supported by said latch and received by said first and second central opening; (g) a spring surrounding said retaining member and disposed to urge said valve plate toward said valve seat; and (h) a resilient spacer member secured to said valve plate for movement therewith and disposed in displaceable engagement with said valve seat for sealing engagement therewith, said spacer member being formed with a third central opening aligned with said first and second central openings and received by said retaining member, said resilient spacer member maintaining the space between said valve seat and said valve plate relatively constant so as not to adversely effect the seating engagement and the sealing engagement between said valve seat and said spacer member in the event of distortion of said cover, (i) said valve plate and said spacer member being displaced from said valve seat against the urgency of said spring in the event the fluid pressure in said shell exceeds a predetermined magnitude of fluid pressure to vent the fluid under pressure in said shell to atmosphere.