High temperature, high pressure valve
First Claim
1. A gate valve comprising a body having a top inlet connected to an inlet passage and a bottom outlet connected to an outlet passage, said passages communicating with a chamber therebetween, a valve seat concentric with said inlet passage, an annular wedge opposite said seat, an imperforate valve head having a seating face adjacent said seat for contact therewith in a closed position, an opposite surface of said head being angled and in contact with said wedge, motor means for reciprocating said head between open and closed positions, a sleeve in said inlet passage with one end thereof contacting said seating surface of said head, said sleeve outer diameter and said seat inner diameter cooperating with the body and head seating surface to define an annular space, means to introduce a pressurized gas into said space for cleaning the interface between said head seating surface and seat just prior to contact between said head seating surface and seat, and a channel providing open communication between an end face of said head and said outlet.
19 Assignments
0 Petitions
Accused Products
Abstract
A gate valve having a top inlet and bottom outlet is provided with a horizontally disposed head slidable between closed and open positions. The valve body includes a seat concentric with an inlet passage and adapted to cooperate with a sealing surface on the head. An annular sleeve is provided within the inlet passage with one end of the sleeve being in contact with the sealing surface on the head. The sleeve and seat cooperate with the valve body and head to define an annular space. A means is provided to pressurize the space immediately prior to contact between the head and the seat. The head is biased to a closed position in the event of power failure. The valve is particularly designed for controlling downward flow of high temperature particulate material under high pressure.
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Citations
12 Claims
- 1. A gate valve comprising a body having a top inlet connected to an inlet passage and a bottom outlet connected to an outlet passage, said passages communicating with a chamber therebetween, a valve seat concentric with said inlet passage, an annular wedge opposite said seat, an imperforate valve head having a seating face adjacent said seat for contact therewith in a closed position, an opposite surface of said head being angled and in contact with said wedge, motor means for reciprocating said head between open and closed positions, a sleeve in said inlet passage with one end thereof contacting said seating surface of said head, said sleeve outer diameter and said seat inner diameter cooperating with the body and head seating surface to define an annular space, means to introduce a pressurized gas into said space for cleaning the interface between said head seating surface and seat just prior to contact between said head seating surface and seat, and a channel providing open communication between an end face of said head and said outlet.
- 6. A gate valve for controlling flow of particles comprising a body having a top inlet connected to an inlet passage and a bottom outlet connected to an outlet passage, said passages communicating with a chamber therebetween, a valve seat in said chamber and concentric with said inlet, an annular wedge in said chamber and opposite said seat, a valve head having a seating face adjacent said seat for contact therewith in a closed position, an opposite surface of said head being angled and in contact with said wedge, motor means connected to said head for reciprocating said head between open and closed positions, a bonnet connected to said body, said motor means retracting said head into said bonnet when the head is in an open position, means cooperating with the body and head to define an annular space concentric with and radially inward of the seat, means cooperating with said head and wedge to define a second annular space adjacent said head surface opposite said seating face, means to introduce a pressurized gas into said spaces for cleaning the interface between said head and seat and wedge just prior to contact between said head and seat, and said chamber being in open communication with said outlet.
Specification