Quick Answer: Orfice Mouthpieces Apparatus measures the coefficient of discharge of orifices and mouthpieces fitted to a 0.4 x 0.3 x 0.5 m supply tank, with 8 mm and 10 mm orifices and four mouthpieces. An X-Y gauge records jet coordinates for calculating the Cv of the orifice.
Last updated: October 2026
Key Features
Orifices of 8 mm and 10 mm
Mouthpieces: L/D = 4, L/D = 1, Borda's and convergent
Universal fixture at the side of the supply tank for mounting an orifice or mouthpiece
X-Y gauge for orifice jet coordinates, used to calculate Cv
0.5 HP pump with by-pass valve to control the head
Measuring tank or calibrated water flow meter for discharge
Technical Specifications
Specification
Value
Supply tank
0.4 x 0.3 x 0.5 m height
Orifices
8 mm and 10 mm
Mouthpieces
L/D = 4, L/D = 1, Borda's, convergent
Jet coordinates
X-Y gauge
Discharge measurement
Measuring tank or calibrated water flow meter
Pump
0.5 HP, with valve
Floor space
2 m x 1 m x 1.5 m height
Supply
230 V, 5 A, stabilised AC
About This Product
A centrifugal pump fills the supply tank, and the by-pass valve at the pump discharge controls the head over the orifice or mouthpiece mounted in the side fixture. Discharge is collected in the measuring tank, while for orifices the X-Y gauge records the jet path so the coefficient of velocity can be calculated. Swapping fittings on the universal fixture lets this engineering lab equipment in India compare orifice and mouthpiece flow in one FLUID MECHANICS LAB set-up.
Frequently Asked Questions
Q1. Which orifices and mouthpieces are supplied? Orifices of 8 mm and 10 mm, and mouthpieces with L/D = 4 and L/D = 1, a Borda's mouthpiece and a convergent mouthpiece.
Q2. How is the head over the orifice controlled? By a by-pass valve provided at the pump discharge.
Q3. How is Cv found? A gauge measures the X and Y coordinates of the jet from the orifice, and these are used to calculate the Cv of the orifice.
