What does the 303091 discharge valve do?

It releases fluid from the fluid end on the pressure (discharge) stroke, opening to let fluid out and closing to prevent backflow as part of the pump's one-way valve set.

What does "AR" mean for the 303091 valve?

AR stands for abrasion resistant, indicating the discharge valve is intended for abrasive service where the pumped fluid carries solids. This is stated in the product name.

Is 303091 an OEM part?

It is an aftermarket replacement discharge valve assembly supplied under part number 303091 to match the original by form and fit.

303091 Valve Assembly; AR, Discharge

303091 Valve Assembly; AR, Discharge — Valve Assembly aftermarket replacement part

The 303091 Valve Assembly is a discharge valve for the fluid end of a reciprocating pump. The discharge valve releases fluid from the pump on the pressure stroke as part of the one-way valve set that controls flow direction. The "AR" designation indicates it is abrasion resistant, intended for abrasive service. This is an aftermarket replacement part supplied under part number 303091 and ships at about 9.2 lb.

What it is

A fluid-end valve assembly controls one-way flow through the pump — a suction valve admits fluid on the intake stroke and a discharge valve releases it on the pressure stroke. It typically comprises the valve body, seat, spring and guide.

Specifications

Property	Value
Weight	9.20 lb (≈ 4.17 kg, converted)
Width	5.75 in / 14.6 cm
Height	5.25 in / 13.3 cm
Depth	5.25 in / 13.3 cm

Manufacturer technical notes

303091 Valve Assembly AR Discharge (SKU:303091), forged 42CrMo alloy steel body (tensile ≥1080MPa) with induction hardening + chrome plating (HRC58-62), salt spray tested >1500hrs corrosion-free, API 7K compliant, pressure-resistant ≥70MPa, compatible with FMC/Buckhorn pumps.

Verbatim from the Dongli product page on dlhddrilling.com.

Replacement / interchange

Aftermarket replacement cross-referencing 303091.

FAQ

What does the 303091 discharge valve do?: It releases fluid from the fluid end on the pressure (discharge) stroke, opening to let fluid out and closing to prevent backflow as part of the pump's one-way valve set.
What does "AR" mean for the 303091 valve?: AR stands for abrasion resistant, indicating the discharge valve is intended for abrasive service where the pumped fluid carries solids. This is stated in the product name.
Is 303091 an OEM part?: It is an aftermarket replacement discharge valve assembly supplied under part number 303091 to match the original by form and fit.

Related parts

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All brand names, model numbers and part numbers are used for identification and cross-reference only and do not imply original-equipment manufacture. This is an aftermarket replacement part.

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