a) multi-threaded end-turn valves, check valves and ball valves with female tapered threads are the ANSI used with pipes up to 2 1/2 “or 3″. b) welding valves range for the direct connection of multi-turn brass valves, check valves and ball valves up to 3 “copper tubing. should be careful not to overheat and damage…

check valves (Backflow Prevention) a) Swing-type check offer the least pressure drop and offer simple automatic closure; when fluid flow stops, gravity and flow reversal closes valve. Many bronze valves offer a Y-pattern body with an angle seat for improved performance. Resilient seating preferred for tighter shutoff. b) Lift checks come in in-line or globe-style…

　a) ball valves 　　　Positive Features – Recommendations 　　　1) Bubble-tight shut-off from resilient (TFE) seats 　　　2) Quick 90° open/close, not torque-dependent for seating 　　　3) Straight-through unobstructed flow, bidirectional 　　　4) Minimal pressure drop if full-port selected 　　　5) Can be throttled (Application dependent) 　　　6) Easier to automate than multi-turn valves 　　　7) More compact than multi-turn valves 　　　8) Offers…

a) gate valves Positive Features – Recommendations 1) Good choice for on-off service 2) Full flow-low pressure drop 3) Bidirectional Disadvantages 1) Not for throttling; use fully opened or fully closed 2) Metal-to-metal seating means not best choice for frequent operation. Bubble-tight seating should not be expected with metal-to-metal design. 3) Difficult to automate. Wedge…

Installation Guide This butterfly valve is bi-directional and may be installed in either direction. Install this valve between any ANSI Class 125 or 150 flange. Cast iron, bronze, plastic or steel flanges may be used. No flange gaskets are required. The stem can be installed in any position, but if a choice of stem positions…