HCK4 In-Line Check Valves

• Low pressure drop
• Mounts in any position
• Stainless steel disc 5/8" through 4" Port (16 mm through 100 mm)
• Typically used in hot gas, discharge, liquid, and suction lines.

HCK1 Piston-Type Check Valves

• High flow
• Manual-opening stem
  
• Bonnet serviceable 3/4" through 6" (20 mm through 150 mm)
• Operating temperature: -25°F to +250°F (-32°C to +121°C)
• Suitable for pump discharge, hot gas lines and pulsating pressure
• Applications including side port to screw compressors.

Combination Stop/Check Valve

• Avoids separate check
• Spring and manual closing
• Reduced pressure drop
• Stainless steel stem
• Single seat: no trapping liquid
• 1 1/4" through 6" (32 mm through 150 mm)
• Safe working pressure: 365 psig (25 bar)
• Temperature range: -60°F to 240°F (-50°C to +116°C)
• Ideal for liquid pump and compressor discharge applications, eliminating the need for pressure relief between the conventional check valve and stop valve
  

MATERIAL SPECIFICATIONS (HCK4-4)
Body:
5/8" thru 1¼": Steel, ASTM A108, zinc chromate plated
1½" thru 4": Ductile iron, ASTM A536, zinc chromate plated

Seat Disc:
Stainless steel

Seat Cartridge:
5/8" thru 1¼": Stainless steel, ASTM A582
1½" thru 4": Steel, ASTM A108, zinc chromate plated

Spring:
Stainless steel

Safe Working Pressure:
400 PSIG (27 bar)

Operating Temperature:
-60F to 240F (-50 to 115°C)

MATERIAL SPECIFICATIONS (HCK-1)

Body:
¾" thru 4": Ductile iron ASTM A536.
5" & 6": Cast steel

Piston/Seat:
¾" thru 1¼": Stainless steel with Teflon® seat
1½" thru 6": Ductile iron, ASTM A536

Closing Spring:
Stainless steel (¾" thru 1¼" only)

Gaskets:
Nonasbestos, graphite composite

Stem:
Plated steel

Cover:
Steel

Stem Seal:
O-ring plus graphite composite packing

Companion Flanges:
Forged steel

Safe Working Pressure:
400 psig (27 bar)

Operating Temperature:
–25F to +250F (–32 to +121°C)

MATERIAL SPECIFICATIONS (Combination Stop Check Valve)

Body:
1¼" (32 mm): ASTM, A105, forged carbon steel
1½" to 6"(32 mm to 150 mm):
ASTM, A352 Grade LCB cast steel

Bonnet:
ASTM, A536, ductile iron

Stem:
Stainless steel

Spring:
Steel

Disc Assy:
ASTM A536, Ductile iron with Teflon seat

Packing Nut:
17-7PA Stainless Steel

Stem Packing:
Graphite composite with Neoprene
O-ring in series

Seal Cap:
1¼" Glass filled polymer
1½" to 4" (50 mm to 100 mm) Zinc plated Steel
5" to 6" (125 mm to 150 mm) Cast Aluminum

Bulletins

• HCK4 In-Line Check Valves (C401)
  
• HCK4"L" Gravity Drain Check Valves (C403)
  
• HCK1 Piston-Type Check Valves (C449)
  
• Combination Stop/Check Valves (C519)