Class 800 Piston Type Lift Check Valve

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MOQ : 5 Units

Class 800 Piston Type Lift Check Valve Specification

Structure
Piston Type Lift Check Valve

Material
Forged Steel

Power
Manual

Pressure
Class 800

Media
Water, Oil, Gas

Working Temperature
Up to 425C

Port Size
1/2 to 2 (DN15 to DN50)

Surface
Black Painted / Anti-Rust Oil Coated

Shape
Straight Pattern

Application
Used in steam, oil, and gas pipelines to prevent backflow

End Connection
Socket Weld / Screwed (NPT/BSP)

Testing & Inspection
API 598 / BS EN 12266-1

Body Cover Joint
Bolted Type

Standard Design
ASME B16.34 / BS 5352

Installation Orientation
Horizontal or Vertical (Upward Flow)

Seat Type
Integral / Renewable Seat

Leakage Class
API 598 Standard

Disc Material
Stainless Steel / Forged Steel

Operation
Automatic (Non-return by Flow)

Class 800 Piston Type Lift Check Valve Trade Information

Minimum Order Quantity
5 Units

Supply Ability
200 Units Per Month

Delivery Time
7 Days

About Class 800 Piston Type Lift Check Valve

Class 800 Piston Type Lift Check Valve

Main Features :

Bolted Body-Cover design for valves from Class 800 up to Class 2500. Valves with welded bonnet also available on request
Screwed with a seal-welded body-bonnet design for valves of Class 2500
Bolted body-bonnet joints provided with spiral-wound stainless steel gasket and graphite filler for maximum protection against leaks
Die-formed graphite inner packing rings and braided graphite end rings with Inconel wire reinforcement and corrosion inhibitor
T-head stem-disc connection of gate valve fully meets strength requirements of API 602 and API 598
Rolled ACME thread on stem for smooth operation
Tapered shoulder on the stem for back seating
Self-aligning type gland assembly with stud-and-nut tightening
Integral hard-faced body seat for globe and check valves
Spring-loaded disc on check valves suitable for no horizontal applications too
Gate and globe valves can be offered with electrical actuators
Austenitic SS forging for body and bonnet of Cryogenic valves, resulting in excellent impact strength, minimal heat loss and resistance to corrosion
Valves can be offered to NACE MR-0175 and other special NACE requirements

Robust Automatic Flow Control

Designed for reliability, our piston type lift check valve offers automated non-return functionality, preventing backflow in oil, gas, and steam pipelines. The bolted cover and stainless or forged steel disc provide strength and long service life, while the straight pattern ensures consistent flow characteristics.

Flexible Installation and Maintenance

With options for socket weld or screwed end connections and installation in both horizontal and vertical (upward flow) positions, this check valve offers flexibility for various pipeline configurations. Maintenance is straightforward, thanks to the renewable or integral seat design and easy bolted cover access.

Comprehensive Standards and Testing

Manufactured to conform with ASME B16.34 / BS 5352 and rigorously tested to API 598 / BS EN 12266-1 standards, each valve is assured for leakage and structural integrity. The black painted or anti-rust coated surface further enhances longevity and resistance to harsh media environments.

FAQs of Class 800 Piston Type Lift Check Valve:

Q: How is the Class 800 Piston Type Lift Check Valve installed?

A: This valve can be installed in either a horizontal pipeline or in a vertical orientation where the flow is upwards. Installation is made straightforward due to its compact, straight pattern shape and available end connections (socket weld or screwed NPT/BSP).

Q: What are the main benefits of using a piston type lift check valve in pipelines?

A: Key benefits include automatic prevention of backflow, high reliability under Class 800 pressures, and compatibility with a range of media such as steam, oil, and gas. The forged stainless or forged steel components enable durability and low maintenance, even at temperatures up to 425C.

Q: When should I choose an integral seat versus a renewable seat?

A: An integral seat is directly machined into the valve body for durability and minimal maintenance in demanding applications. A renewable seat is replaceable, ideal for systems where wear is high and ongoing maintenance or seat replacement is anticipated.

Q: Where is this check valve commonly used?

A: It is widely installed in steam, oil, and gas pipelines for industrial settings. Applications include refineries, chemical plants, and other facilities where protecting equipment from reverse flow is essential.

Q: What is the typical process for testing and inspection?

A: Each valve undergoes thorough testing and inspection compliant with API 598 and BS EN 12266-1 standards. This process includes pressure, leakage, and structural integrity checks to ensure reliable operation prior to installation.

Q: How does automatic operation work in this piston type lift check valve?

A: Operation is non-return, meaning the piston disk lifts under forward flow, allowing media passage. When flow reduces or reverses, the disk drops into place, sealing the valve and preventing backflow, all without manual intervention.

Q: What maintenance practices help extend the valves service life?

A: Routine inspection for wear or deposits and ensuring surface coatings (black paint or anti-rust oil) remain intact will help maximize lifespan. For renewable seat models, periodic seat replacement can be performed as needed to maintain effective sealing.

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