How does the Noz-Chek valve prevent water hammer?

The spring-assisted, low-mass disc responds immediately to flow deceleration. The short stroke and spring force ensure the valve closes before significant reverse velocity develops, eliminating the pressure surge that causes water hammer.

What is the difference between standard pattern and short pattern Noz-Chek valves?

Standard pattern valves have longer face-to-face dimensions suited for new installations with adequate space. Short pattern valves offer reduced face-to-face lengths for retrofit applications or where piping space is constrained, with comparable performance.

Can the spring be customized for specific operating conditions?

Yes. Crane engineers can select or design springs based on your system's flow velocity, deceleration rate, and operating pressure to optimize valve response. If no specific data is provided, a standard spring is supplied.

What seating options are available for the Noz-Chek?

The valve is offered with metal-to-metal seating for high-temperature or abrasive services, or resilient (soft) seating for bubble-tight shutoff in clean fluid applications.

Is the Noz-Chek suitable for compressor applications?

Yes. The Noz-Chek eliminates chatter commonly experienced with conventional check valves in reciprocating compressor suction and discharge service, protecting equipment and improving reliability.

CRANE CHEMPHARMA & ENERGY · CHECK VALVES

Crane Noz-Chek Non-Slam Check Valve – High Performance Nozzle Type Check Valve

Name: Crane Noz-Chek Non-Slam Check Valve – High Performance Nozzle Type Check Valve
Brand: Crane ChemPharma & Energy

Crane Noz-Chek non-slam check valve for water hammer prevention. Sizes 2"-84", Class 150-4500. Ideal for compressors, pumps & pipelines.

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Overview

The Crane Noz-Chek is a nozzle-type non-slam check valve engineered for critical service applications where rapid flow reversal and water hammer pose significant risks to piping systems and rotating equipment. Unlike conventional swing check or dual-plate check valves, the Noz-Chek utilizes a spring-assisted disc with axial movement and a venturi-style flow path to achieve fast dynamic response and minimize reverse velocity.

The valve's unique design features a single moving part—the disc—which travels a short stroke under spring assistance. When flow velocity drops, the compressed spring initiates immediate closure, preventing backflow and eliminating valve slam. This results in reliable protection for pumps, compressors, and other mechanical equipment in fast-reversing systems.

Manufactured to ISO-9001, Stoomwezen, and TUV quality standards, the Noz-Chek is available in standard and short pattern configurations with flanged, butt-weld, or hub end connections. It is suitable for demanding applications in gas transmission, power generation, hydrocarbon processing, and water pipelines.

Key Features

Single moving part – Disc-only design minimizes wear and maintenance requirements
Axial disc movement – Venturi flow path reduces pressure drop across the valve
Spring-assisted closure – Provides rapid response to flow deceleration, preventing slam
Customizable spring selection – Tuned to specific service conditions for optimal valve response
Low mass disc – Enables fast dynamic response and self-dampening closure
Bubble-tight sealing – Available with metal or resilient seating options
Wide size and pressure range – Covers 2" to 84" and pressure classes 150 to 4500 (ASME) and 2000 to 15,000 (API 6A)
Multiple end connections – Flanged, butt-weld ends, hub ends, and special configurations

Specifications

Parameter	Value
Size Range	2" – 84" (DN50 – DN2100)
Pressure Class (ASME B16.34 / API 6D)	150, 300, 600, 900, 1500, 2500, 4500
Pressure Class (API 6A)	2000 – 15,000
End Connections	Flanged RF, Butt-Weld, Hub Ends, Specials
Pattern	Standard and Short Pattern
Design Standards	ASME B16.34, API 6D, API 6A
Quality Certifications	ISO-9001, Stoomwezen, TUV
Seating Options	Metal or Resilient
Materials	Wide range available – consult factory for specific requirements

Applications

The Crane Noz-Chek valve is deployed across industries where backflow prevention and water hammer mitigation are critical:

- Gas Transmission – Compressor suction, discharge, and bypass lines - Power Generation – Feedwater systems, cooling water circuits, blowdown lines, steam service - Hydrocarbon Processing – Catalytic cracking units, hydrotreating processes - Petrochemical / Chemical Processing – Propylene units, extreme service units - Water Transmission – Pipelines, pump and compressor stations

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Contact PC Engineering for pricing, availability, and technical support for Crane Noz-Chek Non-Slam Check Valves. Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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