Product Description

Techno 5050-8 EPDM Check Valve

Cast iron body (ASTM A351 Grade CF8M), 316 stainless steel internals (ASTM A351 Grade CF8M), 316 stainless steel spring (ASTM A313), EPDM seal

The 8″ Wafer Check Valve has the following specifications:

    • A: 3″, B: 8 3/4″, C: 1 7/8″, D: 6 1/8″, E: 5 3/4″ – See diagram
    • ASME Class 125
    • EPDM Temperature Range: -40° F to 300° F
    • Maximum working pressure: 165 psi at 300° F
  • Assembled, inspected, and tested in the USA



ASME Pressure – Temperature Rating
Maximum Non-Shock Pressure – psi

Temp ° F ASME 125
2″ – 12″ Valve
ASME 125
14″ – 24″ Valve
150° F 200 psi 150 psi
200° F 190 psi 135 psi
225° F 180 psi 130 psi
250° F 175 psi 125 psi
275° F 170 psi 120 psi
300° F 165 psi 110 psi
325° F 155 psi 105 psi
350° F 150 psi 100 psi
400° F 140 psi
450° F 125 psi
Hydrostatic Test – psi 350 psi 265 psi


TECHNO Dual-plate, Metal-hinged Wafer-style Check Valves

  • Compact wafer-style, one-piece design
  • Center post fully supports the internal assembly without external pins or plugs
  • No fugitive emissions to atmosphere is ensured due to its standard design, which eliminates through holes and pipe plugs in the body
  • Maximum flow area reduces pressure loss
  • Reduces installation space and time

The dual-plate design produces increased strength with reduced opening and closing time.

Clamp plates offer additional strength to valve plates and allow seals to be changed easily.

Specially designed flat, full-contact seals maintain positive shutoff at low working pressures. Unlike most other valves, these seals are replaced easily in the field.

Torsion springs assist valve plate closure, preventing flow reversal. Consistent valve response ensures against slamming and water hammer.

The shaft features heavy-duty, corrosion-resistant construction.

Shaft supports act as stops to prevent over-travel of valve plates. They are corrosion resistant with large shaft-bearing surfaces and are easily removable for internal assembly, maintenance or change.

Thrust washers reduce friction and wear of valve plate hinges.

Variety of Configurations
Techno offers a wide variety of wafer bodies in different styles and materials. These can be assembled with different disc, spring, and elastomer seal choices to make a valve that exactly fits your application. Contact pdblowers if you would like a quote on any of these options.

Cast Iron
Carbon Steel
Cast Steel
316 Stainless Steel
Aluminum Bronze
Carbon Steel
Cast Steel
316 Stainless Steel
302 SS
316 SS
No Spring
Buna N
Viton A
ASME 125
ASME 150
ASME 300
ASME 600
50 psi-cwp
100 psi-cwp
125 psi-cwp


Techno 5050 vs US Valve 31 Series
pdblowers supplies both the 5050 Series from Techno and the 31 Series from US Valves. These valves are equivalent in performance, materials, and dimensions.

The main functional difference between the two is the retainerless design of the Techno 5050 series. These valves feature a center post that fully supports the internal assembly without any external pins or plugs, so there are no holes and plugs in the body which could potentially allow fugitive emissions to atmosphere. If you have a gas application you may want to consider a 5050 valve from Techno or contact us about a retainerless option from US Valve.

The other difference is the lower cost and wider availability of the standard US Valve 31 series. At pdblowers we keep some models of the 31 series in stock and, when they need to be ordered from the factory, lead times are typically only a few days. Average lead times for Techno 5050 Valves are 1-2 weeks.

8″ Techno 5050 Dual Plate Wafer Check Valve, Retainerless

BOM Number: 8.0 DPW CI 36 U 36 A12 FF SKU: 28897 Categories: ,

Lead time 1-2 weeks

Shipping Weight: 40 lbs
Shipping Dimensions: 11 × 13 × 3.75 in

Techno Valve

Valve Type:


Body Materials:

Cast Iron

Internal Materials:

Stainless Steel

Seal Elastomer:


Pipe Size:


Contact us for more info

Product Accessories