forged brass gate, globe and check valves for water works purposes
1991 Edition

According to IS 13114 (1991), the valve components are specified as follows:

• Body, bonnet, cover, stuffing box, disc, wedge, hinge: forged brass grade FLB compliant with IS 6912:1985.
• Gland, gland nut, ball, stem, stem nut, hinge pin: forged brass or free-cutting brass grades FLB, FHTBI, FHTB2 as per IS 6912:1985 or Type II half hard brass per IS 319:1974.
• Handwheel: primarily cast iron grade FG 200 (IS 210:1978), with alternatives including steel, aluminum alloy, zinc alloy, or non-metallic materials.
• Gland packing: materials like hemp & jute (IS 5414:1969), asbestos (IS 4687:1980), or other suitable materials.
• Springs for spring-loaded check valves: phosphor bronze wire conforming to IS 7608:1987.

These materials ensure durability and corrosion resistance suitable for waterworks operating up to 45°C and a maximum pressure of 2 MPa.

IS 13114 (1991) stipulates precise dimensions and tolerances for forged brass gate, globe, and check valves designed for waterworks applications with a maximum pressure of 2 MPa and temperature up to 45°C. Key points include:

• End-to-end dimensions are detailed in Table 3 of the standard, corresponding to nominal valve sizes to ensure interchangeability.
• Dimensional tolerances should follow IS 2:1960 rounding rules.
• Critical dimensions such as minimum wall thickness, stem diameter, sealing face dimensions, and thread length are specified in Table 2.
• Interchangeability of essential wear components (excluding gate wedges) is maintained for valves of the same size and type.

Refer to IS 13114 Table 3 for comprehensive dimension data and IS 2 for rounding conventions.

Hydrostatic testing under IS 13114 involves subjecting valves to pressure tests verifying the body, seat, and backseat integrity:

• The test medium is water, treated with corrosion inhibitors if necessary.
• Prior to testing, valves and connected piping are vented thoroughly to eliminate air pockets.
• Test pressures are determined based on 1.5 times the design pressure of the valve, as defined in Clause 9.3.2.
• The test includes a body test at higher pressure and seat/backseat tests at designated pressures.
• Acceptance requires no visible leakage during testing; slight seepage at stuffing boxes during body pressure test is permissible if seat test passes.

This procedure ensures the valve's structural and sealing integrity under operating conditions.

IS 13114 covers forged brass valves for waterworks comprising:

• Gate valves: inside screw type with non-rising stems, solid one-piece wedge gates, screwed-in bonnets, and integral seats. Scooping on gate faces is permissible if minimum thickness is maintained.
• Globe valves: inside screw type with rising stems, straight body design, screwed-in bonnet, and integral body seats.
• Check valves: including swing type (axis aligned with body ends, vertical installation with upward flow only) and lift type (disc or ball check valves with straight or vertical lift body designs). Check valves have integral seats and screwed-in covers.

All valves feature screwed female ends and are designed for waterworks at pressures up to 2 MPa and temperatures up to 45°C, ensuring standardization and interchangeability.

Per IS 13114 Clause 13.1 and 13.2, valves must be marked on the body with:

• Manufacturer's name or trademark.
• Nominal size of the valve.
• Direction of flow arrow for globe and check valves.
• Batch or lot number.
• Any additional markings mutually agreed between purchaser and manufacturer.

Additionally, valves may bear the Standard Mark certifying compliance with IS 13114 under BIS supervision.

Handwheels require markings indicating "OPEN" or "SHUT" with directional arrows to denote operation direction (Clause 8.6).

These markings ensure clear identification and traceability for quality control and maintenance purposes.

IS 13114 specifies the following for valve handwheels:

• Handwheels must be fitted on all gate and globe valves, mounted on the tapered square of the valve stem and secured by a nut and washer or screw and washer.
• Operation is designed so that turning the handwheel clockwise (facing it) closes the valve.
• Handwheels must be marked with "OPEN" or "SHUT" and directional arrows, either on the wheel or an attached plate.
• Minimum thread engagement at open or closed positions must be at least two-thirds of the external thread diameter.
• Handwheels are typically cast iron grade FG 200 per IS 210:1978, but may also be made of steel, aluminum alloy, zinc alloy, or non-metallic materials.
• Handwheels may be removed for packing and secured with cord or wire during shipment.

These provisions ensure consistent, safe, and reliable valve operation.

Conformity assessment for valve lots under IS 13114 involves:

• Defining a lot as valves of identical material, nominal size, type, and batch.
• Random sampling from each lot according to IS 4905:1968 methods.
• Sample sizes and acceptance numbers are based on lot size as per Table 5, e.g., 8 samples with zero allowed defects for lots up to 150 valves.
• If the sample passes, a sub-sample is selected for detailed body, seat, and backseat testing.
• The lot is accepted if the number of defects does not exceed the acceptance number; otherwise, it is rejected.

This statistical sampling approach ensures quality compliance and reliable performance of valve batches.