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OTHER PRODUCTS
Our product lines of cast iron, bronze, aluminum, steel and stainless steel simplex and duplex strainers and filters, including flanged, NPT and weld-end models are covered in separate bulletins. Units can also be furnished in other special metals and higher pressure and temperature ratings
Model
72AAF(H)S(S) Series
Cast Carbon or Stainless Steel Flanged Ports
PRESSURE RANGE 200 TO 3600 PSIG & HIGHER — U.S. Patent No.3,567.181
PURPOSE
Kraissl Transfer Valves are used to "parallel" or duplex two pieces of pipeline equipment in continuous flow without shut off of either one. Examples include duplexing of two heat exchangers, filters or tanks. These rugged units are time tested for many years in a wide variety of fluid applications.
APPLICATION
Transfer valves are available in 3/4 through 8 inch sizes in ANSI flange classes 150, 300, 400, 600, 900,1500 and higher. Special ring joint flanges can also be furnished. They provide a simple, cost effective way to duplex flow equipment for applications where continuous flow must be maintained, with no flow interruption for down-side servicing.
DESIGN SPECIFICATIONS
Model 72AAF(H)S series transfer valves provide a consistent design for many sizes and pressure ratings with straight through alignment of the single inlet and outlet ports. Other models with same-side inlet and outlet ports are also available.
These transfer valves are furnished in both standard and high pressure models. NPT and weld-end models are also available. Internal channels are 100% full-flow, having the same cross-sectional area as the equivalent pipe size.
Materials of construction include cast carbon or stainless steel bodies and covers. Valve plugs are of stainless steel, bronze or cast iron. Special valve plugs can be furnished in other materials.
The valve handle guard indicates the side in use. The standard valve handle swings over the inlet port. Special reverse valve handles that swing over the outlet on flanged models can also be furnished. Drain plugs are provided in the valve chamber. An adjustable locking flange holds the valve plug on its seat on standard models. An optional lifting jack can be provided to lift the tapered valve plug off its seat for ease in valve turning in rough service on models not normally furnished with one. The lifting jack is standard on 6" and 8" sizes and all flanged units having a stainless steel valve plug. There are no internal linkages involved. A separate external gland is provided to allow easy access to stem packing without complete disassembly, even while in service.
The rugged, one-piece, all-cast valve housing construction avoids weld failures and potential non-uniformity of other fabricated designs.
Each valve is tested and serial numbered for accountability and traceability. The test results are provided with each valve. Special tests can also be arranged when specified.
ADJUSTABLE, TAPERED VALVE PLUG
The tapered valve plug design provides inherent compensation for wear, temperature changes and other operating variations. Metal to metal contact of sealing surfaces prolong the life of the valve, even in rough service. No special seals or seats are necessary to restore Kraissl valves to their original condition. Optional surface treatments can be furnished on valve plugs to extend life and improve sealing characteristics.
Independent gland adjustment
for external packing access
Tapered, all-metal valve
plug for durability & renewability
Continuous flow
without changeover interruption
Drain connection on valve
chamber
Handle indicates side in use
Optional
gage taps
Optional lifting jack
Optional valve
plug coatings
WHY BUY KRAISSL? An important consideration in selecting transfer valves is performance over the life of the valve, not just initially. We offer the following advantages to our design:
Kraissl valves have been time tested in this application for over 30 years
Our tapered valve plug design self compensates for temperature variations and other operating variables including water
Our rugged, all-cast body construction avoids weld failures and potential non-uniformity of fabricated design
Metal to metal contact of sealing surfaces (rather than non-metallic parts which are subject to deterioration) are more likely to minimize seepage over the life of the valve
Kraissl valves provide a consistent design for many sizes and pressure ratings
Kraissl valves provide straight through port alignment for the single port inlet & outlet
Kraissl valve stem packing can be serviced with the valve “in line” without complete valve disassembly
Kraissl patented design features prevent improper re-assembly if the valve is disassembled - this prevents inadvertent shut off position by virtue of improper assembly
The Kraissl lifting jack (seating device) is simple and external for easy service - there are no internal linkages involved
Each Kraissl valve is tested and serial numbered for accountability and traceability - the test results are attached to each valve, provided with each shipment - special tests other than our standard test conditions can also be arranged when specified