DESIGN:
1. The valve shall be constructed with a two-piece body rated for 150 or 300 psi and with end flanges in full
conformance with ANSI B16.1 Class 125 or Class 250. The main body section and end piece shall contain
integrally cast support feet and lifting lugs.
2. The valve port shall be a 100% clear bore equal to the nominal valve size with no seat hardware in the flow
stream when fully open. The ball shall be self-flushing when in intermediate positions for wastewater service.
3. Double (or single) resilient seats shall provide drop-tight service and shall be located on the ball and mechanically
retained with a stainless steel retaining ring and stainless steel nylok cap screws, which shall pass through
both the resilient seat and the retaining ring. The retaining ring shall be continuous or investment cast with
overlapping sections, serrated grooves and shoulders. The resilient seat shall be field adjustable and replaceable
without removing the valve from the pipeline and mate to a continuous 316 stainless steel body seat ring.
4. Valve shafts shall be inserted into blind hubs in the ball and locked to the ball with taper pins retained with
stainless steel jam bolts. The shaft shall be sealed with resilient grit seals in the body bores.
5. Teflon-lined, fiberglass-backed sleeve bearings shall be located in the body hubs.
6. An adjustable thrust bearing shall be provided to center the ball in the body.
7. Shaft seals shall be of the V-type and shall be replaceable without removal of the valve from the line or the
shaft from the valve.
DESIGN:1. The valve shall be constructed with a two-piece body rated for 150 or 300 psi and with end flanges in full conformance with ANSI B16.1 Class 125 or Class 250. The main body section and end piece shall contain integrally cast support feet and lifting lugs.此阀门应为两片式结构，适应压力150或300psi。端法兰必须完全满足ANSI B16.1标准中class 125或250
