1"-12" Plastic UPVC CPVC FRPP Pph PVDF DN20 DN25 DN40 Pn16 ANSI ASTM JIS ISO Plastic Check Valve

• Customization: Available
• Media: Gas,Oil,Water,Chemical,Steam
• Temperature: Ordinary Temperature
• Material: PVDF/Pph/Ppn/FRPP
• Connection Form: Clamp
• Structure: Check
• Pressure: High Pressure
• Function: Automatic, Preventing Media Backflow
• Sealing Form: Gland Packings Globe Valve
• Flow Direction: Unidirection
• Standard: ANSI
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Transport Package: Wooden Case
• Specification: customized
• Trademark: Yoonad
• Origin: China
• HS Code: 8481804090
• Production Capacity: 10000PCS/Year
• Package Size: 120.00cm * 80.00cm * 80.00cm
• Package Gross Weight: 60.000kg

Product Description

Product Description

The PVDF/PPH/PPN/FRPP check valve is a specialized one-way flow control device crafted from high-performance thermoplastics,designed to prevent media backflow while withstanding aggressive chemical environments. Available in four tailored material variants—PVDF (polyvinylidene fluoride), PPH (polypropylene homopolymer), PPN (polypropylene random copolymer), and FRPP (glass fiber-reinforced polypropylene)—it offers targeted solutions for diverse industrial needs. PVDF delivers exceptional resistance to strong acids, alkalis, and high temperatures (up to 140°C); PPH/PPN provides cost-effective durability for mild-to-moderate corrosives; FRPP enhances mechanical strength via glass fiber reinforcement, suitable for higher-pressure applications.

Structurally, this check valve features a lightweight thermoplastic body, a spring-loaded or gravity-driven disc (matched to the body material), and corrosion-resistant seating surfaces (often EPDM or PTFE). Its non-return mechanism operates automatically: when fluid flows in the desired direction, pressure pushes the disc open, allowing unobstructed passage with minimal pressure drop. When flow ceases or reverses, the disc closes tightly against the seat—powered by spring force or gravity—forming a reliable leak-proof barrier to prevent backflow, media contamination, or system damage.

Ideal for handling corrosive liquids, chemicals, solvents, and industrial wastewater, it is widely used in chemical processing, pharmaceutical production, wastewater treatment, food and beverage plants, and water purification systems. The thermoplastic construction ensures non-toxicity, rust-free performance, and easy maintenance, making it a cost-efficient, long-lasting alternative to metal check valves in harsh chemical environments.

DN	mm	15	20	25	32	40	50	65	80
L(RF)	mm	130	150	160	180	200	230	290	310
L1(BW)	mm	140	152	165	184	203	229	279	318
H	mm	100	105	120	130	135	149	154	169
WT(RF)	Kg	5.4	7	7.4	8.5	12.5	16	25	30
	RMB
DN	mm	350	400	450	500	600	700	800	900
L(RF)	mm	980	1100	1200	1250	1450	1650	1850	2050
L1(BW)	mm			-
H	mm
WT(RF)	Kg	-		-	-
	RMB
DN	mm	15	20	25	32	40	50	65	80
L(RF)	mm	130	150	160	180	200	230	290	310
L1(BW)	mm	152	178	203	216	229	267	292	318
H	mm	100	105	120	130	135	149	154	169
WT(RF)	Kg	5.4	8	8.4	9.2	13.5	17	26	31
	RMB
DN	mm	350	400	450	500	600	700	800	900
L(RF)	mm	980	1100	1200	1250	1450	1650	1850	2050
L1(BW)	mm
H	mm
WT(RF)	Kg
	RMB

Product Advantages

A – Exceptional Chemical Corrosion Resistance
All thermoplastic variants (PVDF/PPH/PPN/FRPP) excel in resisting strong acids, alkalis, solvents, and corrosive industrial media.PVDF handles extreme chemical aggression, while PPH/PPN/FRPP offer reliable protection for mild-to-moderate corrosives, avoiding metal corrosion risks.

B – Targeted Material Versatility
Four tailored options meet diverse demands: PVDF for high temperatures (up to 140°C) and harsh chemicals; PPH/PPN for cost-effective durability; FRPP for enhanced mechanical strength via glass fiber reinforcement, low-to-medium pressure scenarios.

C – Automatic Non-Return Reliability
Spring-loaded or gravity-driven disc design enables automatic operation—no external actuation required. Instantly closes when flow reverses, forming a tight seal to prevent backflow, media contamination, and system damage.

D – Lightweight & Easy Installation

Thermoplastic construction is significantly lighter than metal check valves, reducing transportation costs and easing on-site installation. No heavy lifting equipment needed, cutting labor and pipeline support expenses.

E – Low-Pressure-Drop Performance
Streamlined internal structure and unobstructed flow path minimize pressure loss during forward flow. Optimizes energy efficiency for fluid transfer systems handling corrosive liquids, gases, or mild slurries.

F – Hygienic & Maintenance-Free
Non-toxic, smooth thermoplastic surfaces prevent media residue buildup, complying with food, beverage, and pharmaceutical hygiene standards. Rust-free and wear-resistant, requiring minimal maintenance over long service life.

G – Cost-Effective Long-Term Value
Lower upfront cost than corrosion-resistant metal valves. Durable thermoplastic components resist degradation, reducing replacement frequency and operational costs. Offers superior total cost of ownership in harsh chemical environmen

How does valve work?

A PVDF/PPH/PPN/FRPP check valve operates on an automatic, self-actuated mechanism designed to prevent backflow in corrosive fluid systems, leveraging the durability of its thermoplastic construction. Its core components include a lightweight PVDF/PPH/PPN/FRPP valve body, a matching thermoplastic disc (or flap), a corrosion-resistant seat (EPDM/PTFE), and either a spring (for spring-loaded models) or a gravity-driven design—all engineered to withstand harsh chemicals without degradation.

During forward flow, the pressure of the corrosive liquid, gas, or mild slurry pushes against the disc, overcoming the resistance of the spring (or gravity). This forces the disc to lift or swing open, creating an unobstructed flow path through the valve. The streamlined internal structure minimizes pressure drop, ensuring efficient fluid transfer while the thermoplastic materials maintain structural integrity against corrosive media.

When flow ceases or reverses, the spring (or gravity) immediately acts to close the disc. The disc presses tightly against the PTFE/EPDM seat, forming a bubble-tight seal that blocks backflow. This automatic response prevents media contamination, system pressure loss, or damage to upstream equipment. The thermoplastic construction—whether PVDF for high temperatures, FRPP for enhanced strength, or PPH/PPN for cost-effectiveness—ensures reliable operation across chemical processing, wastewater treatment, and pharmaceutical applications, eliminating the risk of metal corrosion common in traditional valves.