HOKE Check Valves Official Distributor in India

The maximum operating pressure of HOKE Check Valves is 6,000 psig (414 bar) at 70°F for the CVH Series and the 6100/6200 Series in 316 stainless steel and MONEL. The 6100 Series in brass reaches 3,000 psig at 70°F (206.84 bar at 21°C).

The cracking pressures available are 0.5 to 20 psig (0.035 to 1.379 bar) ±10% on the CVH Series and 1/3 to 25 psig on the 6100 and 6200 Series, with 2 psig factory-set as standard on the 6100/6200.

The difference is that the CVH Series is a high-Cv spring-loaded poppet with a floating o-ring seat delivering up to 7.4 Cv and 6,000 psig in alloy bodies, the 6100 Series is a ball check valve built for leak-tight shutoff at 0.3 Cv, and the 6200 Series is a poppet check valve built for larger flows with low chatter at up to 2.4 Cv.

The difference is that a ball check valve uses a spring-loaded ball seated against an o-ring for leak-tight shutoff with minimum flow resistance, while a poppet check valve uses a guided spring-loaded poppet that passes larger flows with less chatter and fluctuation.

The standard body materials are 316 stainless steel (all three series), Monel (6100 Series and CVH Series, where the CVH uses Monel R-405), brass (6100 Series only), and Hastelloy C-276 (CVH Series only). The HOKE Product Summary lists Super Duplex 2507, Duplex 2205, 254 SMO, Inconel 625, Inconel 825, and Titanium across the HOKE valve range; these are available on request and subject to confirmation by HOKE.

Priminox Overseas can supply NPT (male and female), British parallel pipe, British tapered pipe, and GYROLOK tube fittings in fractional and metric sizes on the CVH Series. The 6100 Series ball check is offered with 1/8 inch and 1/4 inch NPT (male and female), 1/4 inch and 3/8 inch Gyrolok, 6 mm Gyrolok, and a 1/4 inch NPT male × 1/4 inch Gyrolok configuration. The 6200 Series poppet check is offered with 1/4 inch NPT (male and female), 1/4 inch, 3/8 inch, and 1/2 inch Gyrolok, and 1/2 inch NPT female.

Yes, HOKE Check Valves install in any orientation. The spring-loaded poppet on the CVH and 6200 Series and the spring-loaded ball on the 6100 Series hold the sealing element on the seat regardless of installation angle.

The operating temperature range is -65°F to +550°F (-54°C to +288°C) for the CVH Series, with 3/4 inch and larger sizes capped at +400°F (204°C). The 6100 and 6200 Series run -40°F to +200°F (-40°C to +93°C) with Buna-N and -20°F to +350°F (-29°C to +177°C) with Viton.

HOKE CVH Series Check Valves deliver in excess of 100,000 life cycles. The floating o-ring design self-cleans on every cycle, which keeps contaminants off the seat and extends service life.

Yes, oxygen cleaning is available on the CVH Series. Specify oxygen cleaning on the purchase order; Buna-N o-rings cannot be used for oxygen service, so pair with Viton, Fluorosilicone, or Kalrez.