PN10 DN40-600 with handwheel. Ductile cast iron Resilient Seated NRS Gate Valve DN040-600 PN10 ABRA A4010 / face-to-face DIN 3202 F4 (F5) with handwheel.

The main applications of that type of gate  valves are using  at steel, cast iron, polyethylene (PE, HDPE), etc. pipelines transporting water and neutral medias. The design of the valve allows it to be used in sewage systems (municipal household sewerage - installation only on vertical pipes). Also, this design can be used on other chemically neutral liquids. Ductile Cast iron NRS resilient gate valves ABRA have excellent chemical resistance to:

• water, including HVAC and DHW water, (cold, hot, including domestic drinking, and hot water supply systems), recycled water of heating networks, demineralized, distilled, carbonated water, etc.
• standard heat carrier of heating networks (heating systems) based on water
• standard antifreezes based on ethylene glycol and propylene glycol, etc.
• technical air without oil or with silicone oil only, etc.

• Ductile cast iron NRS resilient gate valves ABRA,  have face-to-face according to DIN 3202 F4 or F5, excellent lifetime and years checked experience of expluatation all over the world as far as very attrective price for that level of quality.
• The valves in production are double quality controlled - after hydraulic tests, they are additionally tested with air.
• The low hydraulic resistance of the valves provides excellent hydraulic characteristics.

NRS ductile cast "resilient " gate valve ABRA A4010 PN10  schematic sectional drawing (drawings and weights see in table below):

• NRS resilient gate valve is an on-off valve in which the locking element (disk) moves reciprocally perpendicular to the flow direction of the working media
• The minimum face-to-face length ensures excellent usability and convenience in commissioning.
• The full-bore design allows the use of these valves even in sewer systems on the vertical pipelines.
• The design of the wedge gate valve ensures, if necessary, complete disassembly of the valve.
• It is obvious that the gate valve with a rubberized disc allows the flow in any direction.

Table: Sizes,  dimensions, operating pressures and temperatures, torques, weights and Kv  of ABRA A4010 DN200-600 PN10 flanged NRS resilient gate valves. Al sizes are in mm.

• Surface coating (painting) - powder epoxy electrostatic with preheating and exposure to complete polymerization.
• On request, we supply cast iron NRS resilient gate valves  DN700-1200 PN10 and PN16 with face-to-face according to DIN 3202 F4 and F5 (EN558-1 Serie 14 and Serie 15)

ABRA A 4010 DN200-600 PN10 NRS resilient flanged gate valve specification of details and materials:

Pressure / Temperature diagramm for NRS resilient gate valve ABRA A4010 PN 10

Pressure / Temperature diagramm for NRS resilient gate valve ABRA A4010 PN 10 defines the limits of working area for the valve in Pressure/Temperature terms

Table: Description of connecting sizes + suitable standards for connecting of NRS resilient ABRA A4010 gate valve. All dimensions are in mm. Attention! The table is based on the calculation of the installation of valves to steel or cast iron pipes. When installing valves on the clamping flange of polyethylene (PE, HDPE) pipes, longer bolts or studs should be selected according to the reference data under the main table.

Suitable adjacent flange standards and exceptions:

• The estimated service life of the ABRA NRS A40 gate valve is at least 50 years, when used on cold drinking water in accordance with EU Council Directive 98/83/EC, WHO's Guidelines for Drinking-water Quality, (Geneva, 1993), RF  SanPiN 2.1.4.1074-01 and GOST 2874-82 without mechanical violation of the integrity of the protective coating in the temperature range corresponding to the passport.
• The warranty period, subject to the consumer's compliance with the rules of transportation, storage, installation and operation, is set at 12 months from the date of commissioning, but not more than 18 months from the date of sale. If ensured that all the requirements of the estimated service life are fulfilled, the warranty period is at least 10 years or 250 opening/closing cycles (for manually operated valves) without maintenance.
• Tightness class - class "A" according to ISO5208, CEI/IEC 60534-4, GOST 54808 и GOST 9544 (leaks are not allowed.)
• The valve is manufactured in accordance with the safety requirements according to EN1171 и ГОСТ 12.2.063
• Possible construction lengths:  EN558 Sereies 14 and 15, EN558-1 GR (series) 14 and 15, GOST 3706-93 (series 3 and 1), DIN3202 F4 and F5,
• Connecting dimensions of flanges - "flat" types of connecting surface according to EN 1092-1, DIN 2526, GOST 12815/ GOST 12820/GOST 12821/GOST 12822/GOST R 54432/GOST 33259
• The gear or handwheel has a resource for the full service life of the valve without maintenance.
• The material of the housing and the bonnet is ductile iron. The material of the trim parts are ductile iron and stainless steel.  EPDM disk seat material is a thermopolymer of ethylene, propylene and diene with the remaining unsaturated part of the diene in chain. The spindle material is stainless steel. The material of the valve wedge nut is brass or bronze.
• Anticorrosive coating (internal and external) is eliminating corrosion during the entire service life with undisturbed integrity and subject to compliance with all the requirements of the estimated service life.
• The bolts of the cover fastener are protected from corrosion from the inside and outside during the entire service life with undisturbed integrity and compliance, provided that all the requirements of the estimated service life are met.

Instructions for installation, installation and operation of a NRS Resilient gate valve with a rubberized wedge ABRA A40

• The "General Comissioning and Maintanance requirements" are oligatory
• When installing a valve with a rubberized wedge into the dry pipeline, the friction force of rubber on metal does not allow it to be completely closed with reasonable manual efforts. It is necessary to moisten the friction surfaces if you need to close the valve dry. Only water or silicone oils are allowed in minmal posslible amouts to wet the disk and body.
• ABRA NRS Resilient gate valve must be used strictly for their intended purpose in accordance with the operating parameters specified in the technical documentation
• During operation, commissioning and repair work, valves with a rubberized ABRA wedge are not allowed to be used as a control (regulating, throttle) unit.
• For timely detection and troubleshooting, it is necessary to periodically inspect the valve. The inspection is carried out in accordance with the rules and regulations adopted by the company operating the valves.
•    As necessary, it is recommended:
  • spray lubricate the threaded part of the spindle with grease (oil mist - soft film which displaces moisture from wet surfaces) according to API RP 686, BS 1133 (6) or NG-203 grade B grease according to GOST (GOST) 12328-77;
  • tighten the packing if any;
  • restore the broken paint and varnish protective coating.
• All NRS ABRA resilient gate valves parts are interchangeable. It is only not recommended to turn the wedge  with sealing surfaces in order to avoid loss of tightness.
• The NRS resilient gate valve ABRA during operation must be opened fully to the upper stop and tightly closed manually  
•      Safety.
  • The installation, operation and maintenance of NRS resilient gate valves ABRA is allowed only to personnel who have received appropriate training in the field of valves, safety regulations, requirements of this technical description, and have skills in working with on-off valves.
  • Maintenance personnel performing comissioning, disassembly, assembly and repair ABRA rubberized wedge valves must use a serviceable tool, have personal safety equipment and fulfill fire safety requirements.
  • To ensure the safe operation of a NRS resilient gate valves it is strictly prohibited:
    •  to use ABRA NRS gate valves for operating parameters exceeding those specified in this technical description;
    • using of NRS ABRA resilient gate valves in the absence of operational documentation;
    • to perform pressure testing of the pipeline with a pressure higher than the nominal working one;
    • disassemble the valve which is under pressure (has a presuure inside);
    • it is recommended to install a strainer before the valve in the direction of the flow. 
    • In order to avoid injuries, equipment malfunctions, falls, bumps and other damages, it is forbidden to lift the valves with a rubberized wedge by the handwheel, actuator or gearbox.
          Installation procedure
• Mounting and comissioning
  • Before installation, it is necessary:
    • to clean (purge) pipelines from dirt, sand, scale;
    • to perform deconservation, remove the plugs from the passageways, remove anticorrosive grease from the main passages.
  • For ease of maintenance and inspection, as well as to ensure the best flushing of dirt from under the valve wedge when closing, ABRA NRS resilient rubberized wedge gate valves should be installed in the following operating positions (orientations) only:
    • vertical - on horizontal and inclined pipes - (when the handwheel is on top),
    • horizontal - only on vertical pipes
  • Flange connections should be tightened evenly in three or even four passes, in a criss-cross sequence.   see detailed quide with pictures (in Russian)
  • With a decrease in the fixing load in the flange connection as a result of relaxation in the gasket or fastener, or in cases where the technological process is pronounced cyclic in temperature or pressure, additional tightening of the connection may be necessary some time after the start of operation or, in particularly difficult cases, a complete re-set of fasteners with powerful poppet spring washers.
• Mounting and comissioning with electrical actuator
  • Features of installation of gate valves with electrical actuator
    • Before installing the valve in the pipeline, it is necessary to configure the actuator and the valve to work together in accordance with the instructions of the electric drive manufacturer:
    • check the installation or mount the actuator with a valve;
    • when installing a valve with an actuator in any position other than vertical, the actuator must have its own supports;
    • installation of the actuator under the gate valve is strictly not recommended;
    • set the limit switches and torque limits for the "open" and "closed" positions when the disc and seat are coated with silicone grease in order to avoid "dry" operation;
    • perform several cycles of trial opening and closing of the valve using a manual doubler;
    • if the valve opens and closes normally when opened from a manual doubler, connect to the power circuts and control networks and perform several trial opening and closing cycles using an electric drive.
    • Only after performing these operations, if the valve with the actuator is functioning normally, it is allowed to proceed with the installation of the valve on the pipeline.
• Storage.
  • Prior to installation, NRS ABRA resilient gate valves must be stored in warehouses or under a canopy, protecting them from pollution and precipitation, UV radiation and sunlight, ensuring the safety of the packaging, the serviceability of the valve during the warranty period.
  • During long-term storage (more than 6 months from the date of manufacture), ABRA NRS rubberized wedge resilient gate valves must be periodically (at least 2 times a year) inspected, and external dirt and rust should be removed.
  • The pass of ABRA NRS rubberized wedge resilient gate valves must be closed with security  plugs, which must be removed before installation.
  • During storage, the vertical position  (stand up) of ABRA NRS rubberized wedge resilient gate valves is recommended with the handwheel removed.
• Transportation.
  • Storage and transportation should be carried out without shock loads at a temperature of -40 ... +65 ° C.
  • Transportation and storage conditions - closed rooms with clean, dry air in the absence of UV radiation and sunlight.
  • ABRA NRS rubberized wedge resilient gate valves must be transported in a strong wooden or similar container that provides stability when tilted up to 45 degrees (50% of the slope) and are released from possible movements. Transportation is fulfilled with a wedge closed manually to the stop, but not tightened (we remind you that this type of valves does not close "dry" at all).
  • Careful transportation is allowed without packaging, on pallets, while it is recommended to remove the flywheel in order to avoid breakage and it is forbidden to put the load on top of the gate valve.
  • During lifting, loading and unloading, the ABRA NRS rubberized wedge resilient gate valves be in a horizontal position to avoid damage.  
• Regular maintenance
  • Periodically, at least once a month, to carry out monitoring in working condition:
    • external inspection;
    • checking the tightness and leakages;