Brass Vertical Check Valve

Brass vertical spring-loaded lift check valve：Built-in stainless steel reset spring; closure is primarily driven by spring force rather than solely by gravity; theoretically supports any installation orientation (vertical upward/vertical downward/horizontal); engineering practice favors vertical pipeline installation; spring-assisted rapid closing effectively reduces water hammer risk; drawback: the spring has a fatigue life limit; media impurities may cause jamming of the lifting valve disc.

Brass horizontal swing check valve ：Springless design; closure is achieved solely by the weight of the valve disc combined with backflow of the medium; the valve is only suitable for installation with the horizontal hinge oriented upward or with the medium flowing vertically upward; installation with vertical downward flow is strictly prohibited; slow closing speed – high risk of water hammer upon pump shutdown; low pressure loss – reduced risk of spring-related fatigue failure.

Yuanlun brass vertical check valve is spring-loaded lift-type non-return valve. Forged brass body, built-in stainless-steel reset spring and lift-disc assembly. Rely on spring force to realize rapid shut-off when flow reverses, reduce water-hammer hazard.

PN16 nominal pressure-rating, standard working temperature 5℃-90℃(-20℃ or above 90℃ need customized high/low-temperature sealing material). Standard EPDM sealing variant applies for neutral non-corrosive media: cold-hot tap-water, glycol-mixed anti-freeze liquid, low-pressure neutral gas. Standard EPDM version NOT compatible with mineral oil / lubricating oil;oil-containing medium requires FKM fluororubber seal customization.

Although spring-assisted structure allows multi-orientation mounting, this valve is optimized for vertical pipeline installation; long-term horizontal installation will accelerate spring fatigue and reduce service-life. Must follow body-cast flow-direction arrow. Medium containing rust, sand or solid particles must install filter-strainer upstream, impurity will jam lift-disc and cause permanent back-flow leakage.

Suitable for building water-supply, HVAC heating-chilled-water pump outlet circuits, frequent pump start-stop projects.

Important note: Installation recommended to be completed by qualified plumbing / HVAC technicians. Strictly follow valve-body flow-arrow. Dirty-medium must add upstream filter. Long-term service recommend vertical mounting; avoid long-time horizontal layout. Oil / extreme temperature media need custom sealing variant.

Reliable Back-Flow Prevention: Built-in stainless-steel spring-assisted lift-disc mechanism, fast automatic shut-off upon flow reversal, effectively prevent medium back-flow, protect pumps and pipeline equipment.

Compact Simple Structure: Integrated lift-disc spring assembly inside brass body, compact dimensions, few wearing parts, low routine maintenance workload.

Multi-Orientation Mounting Feasibility: Spring-driven closing force is independent of gravity; technically supports vertical-up, vertical-down or horizontal installation. Engineering priority vertical installation; long-term horizontal deployment is not recommended.

Broad Application Compatibility: Fits domestic water-supply, HVAC heating-chilled-water and low-pressure neutral-gas circuits; suitable for pump-outlet loops with frequent pump start-stop to mitigate water-hammer risk.

Important limitation：Standard EPDM seal variant temperature range 5-90℃;not for mineral-oil;-20℃ or >90℃ need custom sealing material.

Specifications

• Main Components & Function

• Operating Principle

Brass vertical spring-loaded lift-type check-valve relies on stainless-steel spring pre-load force for non-return closure：

1. Forward-flow: Inlet medium pressure overcomes spring pre-load force, pushes lift-disc axially away from valve-seat, medium flows through valve following body-cast arrow direction.
2. Flow-stop / reverse-flow: When inlet pressure drops or back-flow appears, stainless-steel reset spring pushes lift-disc tightly onto valve-seat sealing-face, rapidly cut-off reverse-flow to prevent back-flow.
3. Installation reminder：

Spring force is primary closing source;gravity plays only auxiliary role, so it can work in vertical-down-flow condition theoretically.

But long-term horizontal mounting will cause spring uneven stress, accelerate spring fatigue, shorten service-life;prefer vertical installation for formal project.

Medium risk reminder: Solid particles, rust scale can wedge between lift-disc and valve-seat, leading to permanent back-flow leakage. Dirty-medium must install upstream filter-strainer.

Operating reminder: Standard EPDM seal cannot resist mineral oil; oil-containing fluid need FKM fluororubber customized sealing kit.

• Water-Supply Pump Outlet Circuits

Use-case: Back-flow protection for pump outlet loops with frequent start-stop operation in residential / commercial water-supply systems. Project value: Spring-assisted fast closure suppress water-hammer impact, protect pump impeller from reverse rotation damage.

• HVAC Heating & Chilled-Water Hydronic Systems

Use-case: Non-return protection for heating / chilled-water circulating pump outlet and branch pipelines using glycol anti-freeze liquid. Project value: Adapt frequent pump cycling; priority vertical pipeline installation.

• Low-Pressure Neutral-Gas Auxiliary Piping

Use-case: Back-flow prevention for non-corrosive low-pressure neutral-gas auxiliary pipelines. Project value: Spring-lift structure delivers reliable shut-off performance for gas-phase medium.

Application exclusion:

Standard EPDM-seal variant not for mineral oil, lubricating oil, strong-corrosion chemical medium. Oil-containing medium must customize FKM fluororubber sealing.

Standard product temperature 5-90℃;-20℃ or above 90℃ working-condition requires special customized sealing components.

Media carrying sand, rust solid particles must add upstream filter-strainer, otherwise valve will easily suffer back-flow leakage caused by jammed disc.

• Pre-Installation Check

1. Confirm valve DN-size, thread-spec match pipeline port; carefully read body-cast flow-direction arrow.
2. Confirm piping layout: prioritize vertical installation following flow-arrow; avoid long-term horizontal mounting.
3. Inspect brass valve-body, stainless-steel spring, lift-disc and EPDM sealing-ring; reject cracked, deformed, spring-fatigued components.
4. Thoroughly flush whole pipeline before valve installation to remove welding slag, rust scale and solid particles; dirty-medium project must configure upstream filter-strainer.
5. Prepare qualified PTFE-tape for thread joint sealing.

• Installation Steps

1. Wind PTFE-tape 3-5 clockwise-turns on mating pipeline thread port.
2. Mount valve into pipeline, strictly align body-cast flow-arrow with actual medium flow direction. Prefer vertical installation orientation.
3. Apply wrench torque only on valve-body hex flats. Do not apply force to internal spring-lift-disc assembly.
4. After mechanical assembly finished, perform system water-filling and pressure-testing.
5. Test non-return performance: cut-off forward-flow, inspect back-flow phenomenon and thread-joint external-leakage.

• Important Installation Notes

1. Installation recommended for qualified plumbing / HVAC technicians.
2. Priority vertical installation;although spring-structure supports horizontal mounting, long-term horizontal service accelerates spring fatigue and shortens service-life.
3. Pipeline full flushing is mandatory before commissioning;solid impurities will jam lift-disc-valve-seat pair and cause permanent back-flow leakage. Dirty-medium must install upstream filter-strainer.
4. Standard EPDM sealing version cannot be used for mineral-oil;oil-medium requires FKM fluororubber custom-sealing variant.
5. Standard working-temperature range 5-90℃;low-temperature-20℃ / high-temperature＞90℃ require customized sealing parts.

Routine-Maintenance Suggestion

• Visual inspection for thread-joint external-leakage and back-flow phenomenon: Quarterly during system operating-season
• System overhaul: disassemble valve, inspect spring elasticity, clean lift-disc & valve-seat, check sealing-ring ageing condition: Annually
• Replace fatigue-fractured spring or aged sealing-ring; if internal components are heavily damaged, replace whole valve.

When purchasing brass vertical spring-loaded lift check-valve: confirm DN-size, thread-spec, PN16 pressure-rating. Clarify project installation layout: prioritize vertical installation; avoid long-term horizontal running. Confirm medium and temperature: standard EPDM seal only for 5-90℃ water/glycol / low-pressure neutral-gas; mineral-oil, extreme temperature need custom FKM / special sealing variant. Dirty-medium project need to match upstream filter-strainer. If system requires very low pressure-drop and infrequent pump shutdown, select horizontal swing check-valve instead.

Yuanlun brass vertical check valve is PN16 spring-loaded lift-type brass non-return valve, DN15-DN50 size-range. Built-in stainless-steel reset spring provides main closing force for fast shut-off, mitigate water-hammer risk; priority vertical pipeline installation (horizontal technically feasible but not recommended for long-term service). Standard EPDM sealing: working temperature 5-90℃, apply for water/glycol anti-freeze liquid and low-pressure neutral-gas; mineral-oil, extreme temperature scenarios require custom sealing variant. Dirty-medium systems must install upstream filter-strainer. Widely-applied for pump-outlet, water-supply, HVAC heating-chilled--water hydronic-systems with frequent pump start-stop. Sample-order supported for pre-project-evaluation, 15-day standard lead-time for worldwide plumbing-HVAC distributors and engineering-contractors.

Zhejiang Yuanlun Valve Co., Ltd. was founded in 2006, formerly known as Yuhuan Guohong Valve Co., Ltd. It is located in Yuhuan, Zhejiang Province, known as the "Valve Capital of China". After nearly two decades of stable development, Yuanlun Valve is a professional manufacturer for HVAC valves integrating R&D, production and sales. Our product portfolio covers floor heating systems, air-conditioning systems, domestic water valves, including ball valves, thermostatic valves, manifolds, check valves, stop valves, filter valves, angle valves, pipe fittings, corrugated pipes and other series.