초록 ▼

A method and apparatus for manufacturing a bidirectional, corrosion and abrasion resistant gate valve body. In one embodiment, the gate valve body, including flange seals and a liner, are produced in a single molding operation. A mold with appropriate coring either forms or aligns any desired mounti

A method and apparatus for manufacturing a bidirectional, corrosion and abrasion resistant gate valve body. In one embodiment, the gate valve body, including flange seals and a liner, are produced in a single molding operation. A mold with appropriate coring either forms or aligns any desired mounting inserts. Coring is also provided to properly form a packing area, gate passage, fluid passages, and flange mounting seals. Once the mounting inserts have been positioned in the mold cavity, the mold sections are secured together, and a filler material, preferably a thermoplastic resin, is injected into the cavity. Upon hardening of the filler material, the inserts are secured into position. Further, the entire body and liner are a single solid unit comprising the packing cavity, the gate slot for sealing flow areas, the flow passages, and the flange rings for sealing connection of the valve to other mating surfaces. In another embodiment, a valve liner is placed within the mold cavity before filler material is added. The valve liner, instead of the mold, defines the packing area, gate passage, fluid passages, and flange mounting seals.

대표청구항 ▼

A method for constructing a unitary gate valve with a mold, the unitary gate valve having a gate valve body, the mold having two halves which can be removably secured together on a base, the halves having cores for forming a fluid passage, the base having a removable core for forming a valve gate pa

A method for constructing a unitary gate valve with a mold, the unitary gate valve having a gate valve body, the mold having two halves which can be removably secured together on a base, the halves having cores for forming a fluid passage, the base having a removable core for forming a valve gate passage and another core for forming a packing area, comprising the steps of: fabricating a mold, said mold comprising a base and two halves which can be removably secured together on said base, each said half of said mold comprising a fluid passage core, said base comprising a removable gate passage core and a packing area core, said mold halves cooperating to create a filler material gate for receiving a filler material; assembling said mold so that said two halves and said base cooperate to define a cavity for forming said gate valve; introducing said filler material into said filler material gate; curing said filler material to form gate valve, said gate valve comprising a gate valve body having a fluid passage, a gate passage, and a packing area; disassembling said mold; and removing said gate valve from said mold.