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Wafer Type Nrv

Wafer Type Nrv


Description of Wafer Type Nrv:

ZECO wafer type NRV has a shorter face-to-face dimension and dual plate design, the end connection options include wafer type, lug type and double-flange type, and are available in size from 2" to 60" and in pressure ratings from ASME class 150 through 2500. A wide range of body and trim materials are optional on customer's request. Compared to conventional swing check valves, ZECO's wafer type NRV have the advantage of zero leakage toward outside (no bolted or threaded connections), cost savings, they can be installed in any line orientation, superior seal performance, offer minimal line shock, lower pressure loss and zero seat wear.


Features of Wafer Type Nrv:

1. The dual plate design of ZECO wafer type NRV incorporates an internal retention fitting. The fitting does not encroach the gasket sealing surface, to ensure the effective seal between valve and pipeline;

2. The dual plate wafer design of ZECO wafer type NRV makes this check valve lighter, which is only 10~25% of the weight of conventional swing check valve, to saves money in initial valve cost and provides lower installation cost;

3. The spring feature of ZECO wafer type NRV aids in keeping the valve closed and the lighter weight in eliminating pipeline bending loads make the valve flexible installed in any position, to allow you to design your piping layout in the most efficient and least expensive method;

4. When the valve opens, the heel of the dual plate is lifted in the direction of the flow, to avoid that the heel drag across the seating surface and cause wear. When closing the valve, both the two high torsion springs and the back pressure will force disc toe and heel back in turn to the flat seat to complete the seal.


Material of Wafer Type Nrv:

No

Part

Material

1

Body

ASTM A351 CF8

2

Seat Ring

ASTM A182 F304

3

Disc

ASTM A351 CF8

4

Spring

InconelX 750

5

Pin

ASTM A182 F304


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