Insert assembly for a wellhead choke valve

A reverse flow insert assembly for use in the body of a choke valve mounted on a wellhead, the body forming a T-shaped bore comprising a vertically extending bottom opening and component chamber and a horizontally extending side opening, said insert assembly comprising:

• a tubular cartridge for seating in the component chamber, the cartridge having a side wall forming a bore and a side port located to register with the body side opening, the cartridge having upper and lower ends;
• a flow trim positioned in the cartridge bore, the flow trim comprising a cage having a tubular horizontal side wall forming a bore and an end wall closing one end of the bore, the cage side wall forming side opening flow ports and an outlet at it's the other end of the bore, said outlet registering with the cartridge side port and body side opening, the flow trim further comprising flow control means, mounted to the cage side wall, for sliding therealong to throttle the cage flow ports;
• a bonnet secured to the cartridge and closing it's the upper end of the cartridge;
• and
• means, extending through the bonnet, for biasing the flow control means so that it slides along the cage side wall.