Polypropylene (PP) Check Valves
Last Updated: April 1, 2025
Description
Polypropylene (PP) check valves are self-actuating devices designed to prevent the reversal of process flow. They are constructed from polypropylene, a material known for its excellent chemical resistance and durability in exposed environments. These valves are engineered to allow fluid to flow in one direction while automatically preventing backflow, ensuring the integrity of the system they are part of.
Working Principle
PP check valves operate based on the principle of differential pressure. When the pressure on the upstream side of the valve exceeds the pressure on the downstream side, the valve opens, allowing fluid to pass through. If the downstream pressure exceeds the upstream pressure, the valve closes, preventing reverse flow. This self-sealing mechanism is not dependent on gravity or the mounting position, making these valves versatile and reliable in various orientations. The rapid closure of the valve helps to eliminate sudden back-flow, which can cause water hammer, a common issue in fluid systems.
Applications
PP check valves are used in a variety of applications due to their chemical resistance and durability. Specific examples include:
- Chemical processing industries where they handle acids, strong alkalis, and solvents.
- Water treatment facilities where they prevent contamination from backflow.
- Agricultural irrigation systems to maintain consistent water flow and prevent back siphoning.
Advantages over other Manufacturing - Vacuum Equipment
PP check valves offer several advantages over other materials used in vacuum equipment. Their resistance to UV, weathering, and ozone makes them suitable for outdoor applications where other materials might degrade. Additionally, their chemical resistance ensures longevity and reliability in environments where exposure to harsh chemicals is common.
Limitations
Despite their advantages, PP check valves have limitations. They do not perform well when handling chlorinated hydrocarbons or strong oxidation agents. Additionally, their temperature range is limited to between -4° F and 195° F, which may not be suitable for all applications.
Considerations
When selecting PP check valves, several factors should be considered:
- Initial Costs: PP check valves are generally cost-effective, similar to CPVC valves.
- Operating Expense: Due to their durability and chemical resistance, these valves typically have low operating expenses.
- Durability: They are highly durable in environments exposed to UV and harsh chemicals.
- Accuracy: The self-sealing mechanism ensures reliable operation without the need for manual intervention.
- Replacement and Maintenance Costs: Maintenance is minimal due to the valve's resistance to chemical degradation and environmental factors, reducing long-term replacement costs.
from Asahi/America, Inc.
Swing check valves have the option to install an external spring assist assembly. This spring is made from 316SS and is mounted external to the valve. When fluid pressure starts to drop, the spring retracts the swing arm and brings the disc back into the seat position. This effectively reduces the... [See More]
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Material Of Construction:
PVC, PP, PVDF
; PVC; PP; PVDF
- Valve Size: 0.75 to 8.00
from RS Components, Ltd.
1/2"F X 1/2"F Double Check Valve [See More]
- Material Of Construction: Dzr Copper Alloy Bs En 12420 Cw602N; PP
- Maximum Pressure: 145.04
- Connection Description: Compression
from Asahi/America, Inc.
The Asahi/America ball check valve employs a free moving ball, which unseats to permit flow in one direction, but seals against a seat to prevent backflow. It may be installed vertically or horizontally. Also available as foot valve for suction side of pump. [See More]
-
Material Of Construction:
PVC, CPVC, PP and PVDF
; PVC; PP; PVDF
- Valve Size: 0.50 to 4.00
from RS Components, Ltd.
3/4"F X 3/4"F Double Check Valve [See More]
- Material Of Construction: Dzr Copper Alloy Bs En 12420 Cw602N; PP
- Media Temperature: 185
- Maximum Pressure: 145.04
from RS Components, Ltd.
1"F X 1"F Double Check Valve [See More]
- Material Of Construction: Dzr Copper Alloy; PP
- Media Temperature: 185
- Maximum Pressure: 145.04
from RS Components, Ltd.
1 1/4"F X 1 1/4"F Double Check Valve [See More]
- Material Of Construction: Dzr Copper Alloy Bs En 12420 Cw602N; PP
- Media Temperature: 185
- Maximum Pressure: 145.04
from RS Components, Ltd.
1 1/2"F X 1 1/2"F Double Check Valve [See More]
- Material Of Construction: Dzr Copper Alloy Bs En 12420 Cw602N; PP
- Media Temperature: 185
- Maximum Pressure: 145.04
from RS Components, Ltd.
15mm X 15mm DCV Nickel Plated [See More]
- Material Of Construction: Dzr Copper Alloy Bs En 12420 Cw602N; PP
- Media Temperature: 185
- Maximum Pressure: 145.04
from RS Components, Ltd.
28mm X 28mm DCV Nickel Plated [See More]
- Material Of Construction: Dzr Copper Alloy Bs En 12420 Cw602N; PP
- Media Temperature: 185
- Maximum Pressure: 145.04
from Cole-Parmer
bull; Ideal for low-pressure applications. Choose from economical LDPE with neoprene disc; autoclavable PP with neoprene disc; or autoclavable PP with Hastelloy C <reg > springs, O-rings made of Viton <reg >, and built-in 149- Â µm screen <emdash >available in check... [See More]
- Material Of Construction: PP
- Maximum Pressure: 20.00
from GF Piping Systems
GF Piping Systems plastic check valves provide minimum pressure loss and can be mounted horizontally or vertically. Our check valves offer good flow characteristics and compact design. Types: Types 561 and 562 ring in a new generation of valves, featuring more safety, simplicity,. Type 301 Y-Globe... [See More]
- Material Of Construction: ABS; PVC; CPVC; PP; PVDF
- Valve Size: 0.38 to 12.00
- Valve Type: BallDisk; Swing; Wafer
- Connection Description: BoltFlange (optional feature); Tube Fitting; Butt Weld (optional feature); Socket Weld; Fusion
from U.S. Plastic Corporation
These polypropylene check valves have a one piece construction. Valves are rated to 150 PSI maximum. They have a 1-2 PSI spring. Polypropylene is glass filled and the gasket materials is EPDM. Spring is made of 316 stainless steel. [See More]
- Material Of Construction: PP
- Valve Size: 1.00
from Qosina Corp.
Check Valve, Barbed - 80512 [See More]
- Material Of Construction: PP, Silicone; PP
- Media: Air; Water
- Maximum Pressure: 0.50
from Hayward Flow Control
SW Series swing check valves are offered in PVC, Corzan CPVC and PP. Seals and seats are FPM or EPDM. A counterweight is an option for added stability. Swing check valves are furnished with two o-ring flange seals so no additional gaskets are required for installation. All valves are assembled with... [See More]
- Material Of Construction: Corzan; PVC; CPVC; PP
- Valve Size: 3.00 to 8.00
- Valve Type: Swing
- Connection Description: BoltFlange
from Air Logic
The Check Valves permit flow in one direction only; the operation of the check valve is based on the movement of a small disc within the housing. The disc shifts within the housing as the pressure differential changes from forward to reverse. A flat surface on one side of the disc seals off flow,... [See More]
- Material Of Construction: PP
- Valve Size: 0.06 to 0.12
- Valve Type: Wafer
- Connection Description: 1/16" Straight Ports
from NIBCO INC.
Black Polypropylene valves for use with hot corrosive liquids, chemical processing, industrial plating, laboratory and industrial waste drainage systems, and waste treatment systems. Valve pressure rating 20 psi at 73 °F water non-shock full-port, Maximum service temperature 180 °F, Full... [See More]
- Material Of Construction: PP
- Valve Size: 0.50 to 4.00
- Valve Type: BallDisk
- Connection Description: Threaded; BoltFlange; Union
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.12 to 0.19
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting
from Cole-Parmer
bull; Ideal for low-pressure applications. Choose from economical LDPE with neoprene disc; autoclavable PP with neoprene disc; or autoclavable PP with Hastelloy C <reg > springs, O-rings made of Viton <reg >, and built-in 149- Â µm screen <emdash >available in check... [See More]
- Material Of Construction: PP
- Maximum Pressure: 20.00
from U.S. Plastic Corporation
These polypropylene check valves have a one piece construction. Valves are rated to 150 PSI maximum. They have a 1-2 PSI spring. Polypropylene is glass filled and the gasket materials is EPDM. Spring is made of 316 stainless steel. [See More]
- Material Of Construction: PP
- Valve Size: 3.00
from Hayward Flow Control
TC Series true union ball check valves are offered in PVC, Corzan CPVC, and PP. O-rings and seats are FPM or EPDM. 1/4 in. and 3/8 in. sizes are PVConly and are trim check design. They have socket or threaded end connections. Others up to 2 in. sizes have socket and threaded end connections. All... [See More]
- Material Of Construction: Corzan; PVC; CPVC; PP
- Connection Description: Threaded; Socket Weld
- Valve Size: 0.25 to 6.00
- Maximum Pressure: 150.00
from NIBCO INC.
Natural Polypropylene (Chem-Pure) valves for use with deionized water systems, clean chemical processes, pharmaceutical operations and food processing. Valve pressure rating 150 psi at 73 °F water non-shock full-port, Maximum service temperature 180 °F, True Bloc ® design, FKM O-ring,... [See More]
- Material Of Construction: PP
- Valve Size: 0.50 to 3.00
- Valve Type: BallDisk
- Connection Description: Threaded; Union
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.12 to 0.25
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting
from Cole-Parmer
All valves have Viton <reg > diaphragms. [See More]
- Material Of Construction: PP
- Flow (Cv): 8.00
- Maximum Pressure: 100.00
from U.S. Plastic Corporation
Polypropylene and Kynar housing with Viton diaphragm. Will work with vacuum between 2 and 29 in. Hg. and pressures from 1 psi up to 150psi. .5 lb. cracking pressure on all sizes and materials. [See More]
- Material Of Construction: PP
- Valve Size: 0.12
from Hayward Flow Control
WC Series wafer check valves are offered in PVC, PP and PVDF. O-ring material is FPM, EPDM or PTFE encapsulated FPM. Sizes up to 8 in. are supplied with a spacer in PVC and PP materials only. Spacers are not required for DIN or PVDF pipe installations. Spacers allow full disk opening and are... [See More]
- Material Of Construction: PVC; PP; PVDF
- Valve Size: 2.00 to 20.00
- Valve Type: Wafer
- Connection Description: Threaded; Tube Fitting; Socket Weld
from NIBCO INC.
Red Kynar ® (PVDF) valves for use with hot corrosive liquids, chemical processing, industrial plating, and waste treatment systems. Valve pressure rating 150 psi at 73 °F water non-shock full-port, Maximum service temperature 280 °F, Full port, True Bloc ® design, FKM O-ring, Female... [See More]
- Material Of Construction: PP; PVDF
- Valve Size: 0.50 to 4.00
- Valve Type: BallDisk
- Connection Description: Threaded; BoltFlange; Union; Socket Weld
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.12 to 0.38
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting
from Cole-Parmer
• Use with liquids and gases for pressure or vacuum applications. • Breaking pressure is 0.18 psi, closing pressure is 0.014 psi. • Install in any position. <b >Note: </b > Valves require 1 psi back pressure for a tight seal. [See More]
- Material Of Construction: PP
- Flow (Cv): 0.12
- Maximum Pressure: 50.00
from U.S. Plastic Corporation
Hayward true check ball check valves with viton seals, NSF listed material and 150 PSI at 70 degrees F., prevent reversal of flow in piping systems. They are ideal where backflow could potentially cause damage to pumps, filters, or process equipment. Line pressure unseats the solid plastic ball to... [See More]
- Material Of Construction: PP
- Valve Size: 0.50
- Valve Type: BallDisk
- Connection Description: Threaded; Union
from Hayward Flow Control
YC Series y-check valves are offered in PVC and Corzan CPVC. O-rings are FPM standard but EPDM is available. All sizes are either socket, threaded or flanged body style. True union socket or threaded end connections are available. For spring-loaded y-check valves, see the SLC Series. All valves are... [See More]
- Material Of Construction: Corzan; PVC; CPVC; PP
- Connection Description: Threaded; Socket Weld
- Valve Size: 0.50 to 4.00
- Maximum Pressure: 150.00
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.19 to 0.25
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting
from Cole-Parmer
• Use with liquids and gases for pressure or vacuum applications. • Breaking pressure is 0.18 psi, closing pressure is 0.014 psi. • Install in any position. <b >Note: </b > Valves require 1 psi back pressure for a tight seal. [See More]
- Material Of Construction: PP
- Flow (Cv): 0.11
- Maximum Pressure: 50.00
from U.S. Plastic Corporation
The 695 series is a general purpose check valve that operates in any position, horizontal or vertical. A great low-resistance, high flow check valve where space is limited. Available in nylon for general purpose use and polypropylene for excellent chemical resistance, positive seal at pressure. [See More]
- Material Of Construction: PP
- Valve Size: 0.12
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.19 to 0.38
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting
from U.S. Plastic Corporation
Orifice Size: 3/16". Diameter: 1-1/8". Length: 2-1/16". Cv Factor: 0.50. Maximum psi @ 75F: 125. Maximum Temperature rating: 180F. [See More]
- Material Of Construction: PP
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.25 to 0.38
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting
from U.S. Plastic Corporation
Diameter: 1.3". Length: 3.8". Working psi @ 77F: 100. Maximum Temperature: 180F. Note: Polypropylene is 20% glass filled. [See More]
- Material Of Construction: PP
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.12 to 0.19
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting
from U.S. Plastic Corporation
1 1/2"cks pp diaphragm check valve-epdm [See More]
- Material Of Construction: PP
- Valve Size: 1.25 to 1.50
from ARKPLAS
All Ark-Plas ® Check Valve barbs are molded without a parting line. This means that every sealing surface on each barb is seamless all the way around, eliminating flash, or mold mismatch. Coupled with our high-quality manufacturing processes, a barb without a parting line helps to ensure a... [See More]
- Material Of Construction: PP
- Valve Size: 0.12 to 0.25
- Valve Type: BallDisk
- Connection Description: Tube Fitting; Barbed Fitting